### Basic WebDriver Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/webdriver/index.html

Demonstrates the minimal setup required to get a WebDriver instance for testing. This is useful for starting any automated browser interaction.

```kotlin
import org.http4k.client.WebDriver
import org.http4k.core.Method.GET
import org.http4k.core.Request
import org.http4k.core.then
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = org.http4k.core.HttpHandler { Request(GET, "/") ->
        org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello http4k!")
    }

    val server = app.asServer(Netty(0)).start()

    val driver = WebDriver(server)

    println(driver.get("/"))

    server.stop()
}
```

--------------------------------

### Example: Basic HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/contributing/index.html

A simple http4k application demonstrating a basic HTTP server setup. This example shows how to define a route and start a server.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { Response(OK).body("Hello, http4k!") }
    )
)

fun main() {
    val server = app.asServer(Netty(9000)).start()
    println("Server started on port ${server.port()}")
}
```

--------------------------------

### Basic http4k App Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/news/tale-of-the-tape-claude-vs-http4k/index.html

Demonstrates the minimal setup for an http4k application, including defining routes and starting the server.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = routes(
    "/" / Path.fixed("name") bind GET to { req ->
        Response(OK).body("Hello, ${req.path("name")}!")
    }
)

fun main() {
    val appWithFilter = DebuggingFilters.PrintRequest().then(app)
    appWithFilter.asServer(Netty(9000)).start()
}
```

--------------------------------

### Server Implementation Examples

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/overview/index.html

Provides examples of starting an HTTP4K server using different underlying server implementations.

```kotlin
// SunHttp (built-in)
val sunHttpServer = app.asServer(SunHttp(9000)).start()

// Jetty
val jettyServer = app.asServer(Jetty(9000)).start()

// Netty
val nettyServer = app.asServer(Netty(9000)).start()

// Apache
val apacheServer = app.asServer(Apache(9000)).start()
```

--------------------------------

### Basic http4k Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/news/http4k-v6-still-the-most-testable-web-toolkit-on-the-planet/index.html

A minimal http4k server setup demonstrating the core components and how to start a basic HTTP server.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.lens.string
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app: HttpHandler = routes(
        "/hello" bind GET to { request: Request ->
            val name = Path.string().map(String::capitalize).required("name")
            Response(OK).body("Hello, ${name(request)}!")
        }
    )

    val server = DebuggingFilters.PrintRequest().then(app).asServer(Netty(9000)).start()

    println("Server started on http://localhost:${server.port()}")
}
```

--------------------------------

### Basic Agent Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/agents/index.html

Demonstrates the fundamental setup for an HTTP4K agent. This is useful for starting new projects or understanding the core agent structure.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.ServerFilters.CatchAll
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app: HttpHandler = routes(
        "/hello" bind GET to { request ->
            val name = Path.of("name")
            val nameValue = name(request)
            Response(OK).body("Hello, $nameValue!")
        }
    )

    CatchAll(app).asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic WebSocket Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/serve_websockets/index.html

Demonstrates the minimal configuration required to start a WebSocket server with HTTP4K. This setup listens for incoming WebSocket connections.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer
import org.http4k.websocket.WsHandler
import org.http4k.websocket.WsMessage
import org.http4k.websocket. நோக்க

val app: HttpHandler = routes(
    "" bind { Response(OK) },
    "ws" bind நோக்க {
        onConnected { 
            println("Client connected")
        }
        onMessage { msg: WsMessage ->
            println("Received message: ${msg.body}")
            send(WsMessage("Echo: ${msg.body}"))
        }
        onDisconnected { 
            println("Client disconnected")
        }
    }
)

fun main() {
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic HTTP4K Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/connect/index.html

Demonstrates the fundamental setup of an HTTP4K server with a simple route. This is the starting point for most HTTP4K applications.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { Response(OK).body("Hello, World!") },
        "/users/{name}" bind GET to { req ->
            val name = Path("name").invoke(req)
            Response(OK).body("Hello, $name!")
        }
    )
)

fun main() {
    val server = app.asServer(Netty(9000)).asServer(Netty(9000))
    println("Server started on http://localhost:9000")
    server.start()
}
```

--------------------------------

### Systems Manager Client Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/amazon/systemsmanager/index.html

Demonstrates how to create and use a Systems Manager client, showing both real and fake client options. It includes examples of putting and getting parameters.

```kotlin
package content.ecosystem.connect.reference.amazon.systemsmanager

import dev.forkhandles.result4k.Result
import org.http4k.aws.AwsCredentials
import org.http4k.client.JavaHttpClient
import org.http4k.connect.RemoteFailure
import org.http4k.connect.amazon.core.model.Region
import org.http4k.connect.amazon.systemsmanager.FakeSystemsManager
import org.http4k.connect.amazon.systemsmanager.Http
import org.http4k.connect.amazon.systemsmanager.SystemsManager
import org.http4k.connect.amazon.systemsmanager.action.PutParameterResult
import org.http4k.connect.amazon.systemsmanager.getParameter
import org.http4k.connect.amazon.systemsmanager.model.ParameterType
import org.http4k.connect.amazon.systemsmanager.model.SSMParameterName
import org.http4k.connect.amazon.systemsmanager.putParameter
import org.http4k.core.HttpHandler
import org.http4k.filter.debug

const val USE_REAL_CLIENT = false

fun main() {
    val paramName = SSMParameterName.of("name")

    // we can connect to the real service or the fake (drop in replacement)
    val http: HttpHandler = if (USE_REAL_CLIENT) JavaHttpClient() else FakeSystemsManager()

    // create a client
    val client = 
        SystemsManager.Http(Region.of("us-east-1"), { AwsCredentials("accessKeyId", "secretKey") }, http.debug())

    // all operations return a Result monad of the API type
    val putParameterResult: Result<PutParameterResult, RemoteFailure> = 
        client.putParameter(paramName, "value", ParameterType.String)
    println(putParameterResult)

    // get the parameter back again
    println(client.getParameter(paramName))
}
```

--------------------------------

### Basic http4k Application Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/your_first_http4k_app/index.html

This snippet shows the minimal setup for an http4k application. It defines a simple 'Hello World' endpoint and starts an embedded Jetty server.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(routes(
    "/" bind GET to { Response(OK).body("Hello, http4k!") },
    "/user/{name}" bind GET to { request ->
        val name = Path.of("name")(request)
        Response(OK).body("Hello, $name!")
    }
))

fun main() {
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic Approval Test Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/approvaltests/index.html

Demonstrates the minimal setup required to start using Approval Tests with http4k. Ensure you have the necessary Maven/Gradle dependencies.

```kotlin
import org.http4k.client.OkHttpExtensions.client
import org.http4k.core.Method.GET
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.ClientFilters.SetBaseUriFromSystemProperty
import org.http4k.server.ApacheServer
import org.http4k.server.asServer
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.approvaltests.Approvals
import org.approvaltests.reporters.Reporters

@ExtendWith(org.http4k.testing.ApprovalTest::class)
internal class ApprovalTest {

    @Test
    fun `hello world`() {
        val app = { _: Request -> Response(OK).body("hello world") }
        val server = app.asServer(ApacheServer()).start()
        val client = SetBaseUriFromSystemProperty(server).then(org.http4k.client.OkHttp()) // Use OkHttp client

        val response = client(Request(GET, "/"))

        Approvals.verify(response.bodyString(), Reporters.displayName)
        server.stop()
    }
}
```

--------------------------------

### TDing HTTP4K Setup and Basic Usage

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part2/index.html

Demonstrates the initial setup and basic usage of TDing HTTP4K, including necessary imports and a simple test case.

```kotlin
import org.http4k.client.OkHttp3Client
import org.http4k.core.Method.GET
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.ClientFilters.SetHost
import org.http4k.lens.string
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {

    val app = routes(
        "/" bind GET to { req: Request ->
            val name = "name"(req)
            Response(OK).body("Hello, $name!")
        }
    )

    val server = app.asServer(Netty(9000)).start()

    val client = SetHost("localhost:9000").then(OkHttp3Client())

    val request = Request(GET, "/").query("name", "http4k")
    val response: Response = client(request)

    println(response.status)
    println(response.bodyString())

    server.stop()
}
```

--------------------------------

### Basic HTTP Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/x402/index.html

Demonstrates the fundamental setup of an HTTP server using the X402 library. This includes creating a server instance and binding it to a specific port.

```kotlin
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = { req: org.http4k.core.Request -> org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, http4k!") }

    app.asServer(org.http4k.server.Netty(9000)).start()
}
```

--------------------------------

### Basic http4k Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/index.html

A simple http4k server that responds with 'Hello, http4k!' to any request. This is a fundamental example for getting started with http4k.

```kotlin
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = routes(
        "/" bind GET to { Response(OK).body("Hello, http4k!") }
    )

    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/use_a_server_backend/index.html

Demonstrates the fundamental setup for an http4k server using a simple handler.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = { request ->
    Response(OK).body("Hello, ${request.method} ${request.uri.path}!")
}

fun main() {
    val decoratedApp = DebuggingFilters.PrintRequest().then(app)

    decoratedApp.asServer(Netty(9000)).start()
}
```

--------------------------------

### GraphQL Server and Client Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/graphql/index.html

Demonstrates setting up a GraphQL server with http4k, defining queries, and then consuming it from a client. Includes server startup and a sample client request.

```kotlin
package content.ecosystem.http4k.reference.graphql

import com.expediagroup.graphql.generator.SchemaGeneratorConfig
import com.expediagroup.graphql.generator.TopLevelObject
import com.expediagroup.graphql.generator.toSchema
import graphql.GraphQL.newGraphQL
import org.http4k.client.JavaHttpClient
import org.http4k.client.asGraphQLHandler
import org.http4k.core.HttpHandler
import org.http4k.core.Uri
import org.http4k.graphql.GraphQLHandler
import org.http4k.graphql.GraphQLRequest
import org.http4k.graphql.GraphQLResponse
import org.http4k.routing.bind
import org.http4k.routing.graphQL
import org.http4k.routing.graphQLPlayground
import org.http4k.routing.routes
import org.http4k.server.SunHttp
import org.http4k.server.asServer

object MyGraphQLHandler : GraphQLHandler {
    private val graphQL = newGraphQL(
        toSchema(
            SchemaGeneratorConfig(supportedPackages = listOf("content.ecosystems.http4k.module.graphql")),
            listOf(TopLevelObject(UserQueries())),
            listOf()
        )
    ).build()

    override fun invoke(request: GraphQLRequest) =
        GraphQLResponse.from(graphQL.execute(request.query))
}

data class User(val id: Int, val name: String)
data class Params(val ids: List<Int>)

class UserQueries {
    private val userDb = listOf(
        User(id = 1, name = "Jim"),
        User(id = 2, name = "Bob"),
    )

    fun search(params: Params) = userDb.firstOrNull { it.id in params.ids }
}

fun main() {
    val app: HttpHandler = routes(
        "/graphql" bind graphQL(MyGraphQLHandler),
        graphQLPlayground(Uri.of("/graphql"))
    )

    // serve GQL queries/mutations at /graphql
    app.asServer(SunHttp(8000)).start()

    // for clients, just convert any app into a GQL handler
    val gql: GraphQLHandler =
        JavaHttpClient().asGraphQLHandler(Uri.of("http://localhost:8000/graphql"))
    val response: GraphQLResponse = gql(
        GraphQLRequest(
            """
            {
                search(params: { ids: [1]}) {
                    id
                    name
                }
            }
            """
        )
    )
    println(response)

    println("You can visit the GraphQL playground at: http://localhost:8000")
}

```

--------------------------------

### Initialize OpenFeature SDK

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/openfeature/index.html

Initialize the OpenFeature SDK with a provider. This is a basic setup for getting started.

```javascript
import { OpenFeature } from '@openfeature/server-sdk';

const provider = new MyProvider(); // Replace with your actual provider

OpenFeature.setProvider(provider);
OpenFeature.setLogger(new MyLogger()); // Optional: set a custom logger
```

--------------------------------

### Basic http4k Application Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part1/index.html

This snippet shows the minimal setup for an http4k application, including necessary imports and the main function. It serves as the starting point for TDD development.

```kotlin
package com.example.app

import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.ApacheServer
import org.http4k.server.asServer

fun app(): HttpHandler = routes(
    "/" bind GET to { Response(OK).body("Hello, World!") }
)

fun main() {
    val app = DebuggingFilters.PrintRequest().then(app())
    println("Starting server on http://localhost:9000")
    app.asServer(ApacheServer(9000)).start()
}
```

--------------------------------

### Basic HTTP Request Example

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/integrate_with_openapi/index.html

A simple example demonstrating how to make an HTTP GET request using a common library. Ensure the library is installed and imported.

```javascript
const axios = require('axios');

async function fetchData(url) {
  try {
    const response = await axios.get(url);
    console.log('Data:', response.data);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
}

fetchData('https://api.example.com/data');
```

--------------------------------

### Basic http4k App Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/your_first_http4k_app/index.html

This snippet shows the minimal setup for an http4k application. It defines a simple route that responds with 'Hello World!' to any request.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { request ->
            Response(OK).body("Hello World!")
        }
    )
)

fun main() {
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic HTTP Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/connect/index.html

Demonstrates how to create a simple HTTP server using HTTP4K. This is the foundational step for any HTTP4K application.

```kotlin
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = { request: org.http4k.core.Request ->
        org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, HTTP4K!")
    }

    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Initialize OpenFeature SDK

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/openfeature/index.html

Initializes the OpenFeature SDK with a default provider. This is a basic setup for getting started.

```kotlin
import dev.openfeature.sdk.*

fun main() {
    OpenFeature.setProvider(InMemoryProvider())
    val client = OpenFeature.getClient()

    val booleanValue = client.getBooleanDetails("my-boolean-flag")
    println("Boolean flag: ${booleanValue.value}")

    val stringValue = client.getStringDetails("my-string-flag")
    println("String flag: ${stringValue.value}")

    val numberValue = client.getNumberDetails("my-number-flag")
    println("Number flag: ${numberValue.value}")

    val objectValue = client.getObjectDetails("my-object-flag")
    println("Object flag: ${objectValue.value}")
}
```

--------------------------------

### Server Example: Apache Server

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/index.html

Demonstrates how to start an http4k application using the Apache Server implementation. This is one of the available server backends.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.ApacheServer
import org.http4k.server.asServer

val app: HttpHandler = routes(
    "/" bind GET to { Response(OK).body("Hello, World!") }
)

fun main() {
    println("Starting server on http://localhost:9000")
    app.asServer(ApacheServer(9000)).start()
}
```

--------------------------------

### Basic HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/core/index.html

A simple http4k server that responds with 'Hello, World!' to any request. This is a fundamental example to get started with http4k.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { Response(OK).body("Hello, World!") },
        "/users/{id}" bind GET to { req ->
            val id = Path.of("id")(req)
            Response(OK).body("User ID: $id")
        }
    )
)

fun main() {
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic HTTP4K Application

Source: https://github.com/http4k/http4k.github.io/blob/master/community/index.html

A simple HTTP4K application that echoes the request method and URI. This serves as a fundamental example for getting started.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.lens.string
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun app(): HttpHandler = routes(
    "/" bind GET to { request ->
        Response(OK).body("Hello, ${request.method} ${request.uri.path}!")
    }
)

fun main() {
    val app = app()
    println("Starting server on http://localhost:9000")
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic Templating Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/use_a_templating_engine/index.html

Demonstrates the minimal setup required to initialize and use a templating engine with HTTP4K. This is useful for simple rendering tasks.

```kotlin
import org.http4k.template.HandlebarsTemplates

val renderer = HandlebarsTemplates()
val template = renderer( """
    <h1>Hello {{name}}!</h1>
"""
)

val viewModel = object { val name = "World" }

println(template(viewModel))
```

--------------------------------

### Initialize and Run MCP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/create_an_mcp_server/index.html

This snippet shows the basic commands to initialize a new MCP server and start it. Ensure you have MCP installed.

```bash
mcp init
mcp start
```

--------------------------------

### Basic HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/outbox/index.html

A simple HTTP server using Http4k to handle requests and return responses. This is a fundamental example for getting started.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Route
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { Response(OK).body("Hello, World!") },
        "/users" bind GET to { Response(OK).body("Users list") }
    )
)

fun main() {
    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic Integration Test Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part3/index.html

Demonstrates the basic setup for an integration test using http4k. This involves creating an app and a client to interact with it.

```kotlin
class MyTest {

    @Test
    fun `my app returns hello world`() {
        val app = MyLenses.app
        val client = app.toClient()

        val response = client(Request(Method.GET, "/"))

        assertThat(response.status.code).isEqualTo(200)
        assertThat(response.bodyString()).isEqualTo("Hello World!")
    }
}
```

--------------------------------

### Serve a Simple Websocket

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/serve_websockets/index.html

This example demonstrates how to create and start a basic websocket server that sends a 'hello' message upon connection.

```kotlin
package content.howto.serve_websockets

import org.http4k.server.Jetty
import org.http4k.server.asServer
import org.http4k.websocket.Websocket
import org.http4k.websocket.WsMessage

val server = { ws: Websocket -> ws.send(WsMessage("hello")) }.asServer(Jetty(9000)).start()
```

--------------------------------

### Hot Reload Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/_md/ecosystem/http4k/reference/hot_reload/index.md

Configure and start the HotReloadServer by implementing the HotReloadable interface. This example uses the default port 8000 and SunHttp server.

```kotlin
package ecosystem.http4k.reference.hot_reload

import content.ecosystem.http4k.reference.hot_reload.MyApp

import org.http4k.core.HttpHandler
import org.http4k.hotreload.HotReloadServer
import org.http4k.hotreload.HotReloadable

// This class is needed to create a HotReloadable instance of the HttpHandler
class ReloadableHttpApp : HotReloadable<HttpHandler> {
    override fun create() = MyApp()
}

fun main() {
    // Start the HotReloadServer - configuration is available for non-standard setups
    HotReloadServer.http<ReloadableHttpApp>().start()
}


```

--------------------------------

### Running http4k app within Playwright tests

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/playwright/index.html

This example demonstrates how to start an http4k application directly within your Playwright test setup. This ensures the application is running before tests begin and is shut down afterwards.

```kotlin
import com.microsoft.playwright.Playwright
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = { request -> "Hello, ${request.uri.path}!" }
    val server = app.asServer(Netty(9000)).start()

    val playwright = Playwright.create()
    val browser = playwright.chromium().launch()
    val page = browser.newPage()
    page.navigate("http://localhost:9000/world")
    println(page.content())

    browser.close()
    playwright.close()
    server.stop()
}
```

--------------------------------

### Creating an HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/backoffice/index.html

Shows how to set up a basic HTTP server that responds to requests.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.lens.Path
import org.http4k.lens.string
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = routes(
    "/hello" bind GET to { Response(OK).body("Hello, World!") },
    "/user/{name}" bind GET to { request ->
        val name = Path.string().of("name")(request)
        Response(OK).body("Hello, $name!")
    }
)

fun main() {
    val printingApp = DebuggingFilters.PrintRequest().then(app)

    val server = printingApp.asServer(Netty(9000)).start()

    println("Server started on http://localhost:9000")

    // To stop the server later:
    // server.stop()
}

```

--------------------------------

### Creating an HTTP Client

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part1/index.html

This example shows how to make a GET request to a specified URL using HTTP4K's client capabilities. Ensure http4k-client-apache is included.

```kotlin
import org.http4k.client.Apache
import org.http4k.core.Method.GET
import org.http4k.core.Request

val client = Apache()
val request = Request(GET, "http://localhost:9000/")
val response = client(request)

println(response.status)
println(response.bodyString())

```

--------------------------------

### DynamoDB Table Repository Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/amazon/dynamodb/index.html

Demonstrates the full lifecycle of interacting with a DynamoDB table using the http4k Table Mapper, including client setup (real or fake), table creation, saving, getting, scanning, and deleting items.

```kotlin
package content.ecosystem.connect.amazon.dynamodb

import org.http4k.aws.AwsCredentials
import org.http4k.client.JavaHttpClient
import org.http4k.connect.amazon.core.model.Region
import org.http4k.connect.amazon.dynamodb.DynamoDb
import org.http4k.connect.amazon.dynamodb.FakeDynamoDb
import org.http4k.connect.amazon.dynamodb.Http
import org.http4k.connect.amazon.dynamodb.mapper.tableMapper
import org.http4k.connect.amazon.dynamodb.model.Attribute
import org.http4k.connect.amazon.dynamodb.model.TableName
import org.http4k.filter.debug
import java.util.UUID

private const val USE_REAL_CLIENT = false

// define our data class
private data class Person(
    val name: String,
    val id: UUID = UUID.randomUUID()
)

private val john = Person("John")
private val jane = Person("Jane")

fun main() {
    // build client (real or fake)
    val http = if (USE_REAL_CLIENT) JavaHttpClient() else FakeDynamoDb()
    val dynamoDb = DynamoDb.Http(Region.CA_CENTRAL_1, { AwsCredentials("id", "secret") }, http.debug())

    // defined table mapper
    val table = dynamoDb.tableMapper<Person, UUID, Unit>(
        tableName = TableName.of("people"),
        hashKeyAttribute = Attribute.uuid().required("id")
    )

    // create table
    table.createTable()

    // save
    table.save(john)
    table.save(jane)

    // get
    val johnAgain = table.get(john.id)

    // scan
    val people = table.primaryIndex().scan().take(10)

    // delete
    table.delete(john)
}
```

--------------------------------

### HTTP Client Setup with Default Configuration

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/concepts/clients/index.html

Demonstrates how to create a basic HTTP client using the default configuration. This is suitable for most common use cases.

```kotlin
import org.http4k.client.OkHttp"

val client = OkHttp()

```

--------------------------------

### Basic http4k App Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/your_first_http4k_app/index.html

This snippet shows the minimal setup for an http4k application. It requires importing necessary http4k modules.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters
import org.http4k.routing.bind
import org.http4k.routing.routes

val app: HttpHandler = DebuggingFilters.PrintRequest().then(
    routes(
        "/" bind GET to { Response(OK).body("Hello, http4k!") }
    )
)

fun main() {
    val server = org.http4k.server.Netty(::app)
    server.start()
}
```

--------------------------------

### Basic AI Client Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k-ai/index.html

Demonstrates how to initialize a basic http4k client for interacting with an AI service. Ensure necessary dependencies are included.

```kotlin
import org.http4k.client.JavaHttpClient
import org.http4k.core.HttpHandler

val http: HttpHandler = JavaHttpClient()

```

--------------------------------

### Get Installation Token

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/connect/reference/github/index.html

Retrieves an installation access token for a specific GitHub App installation.

```kotlin
val token = gitHubApp.installation("YOUR_INSTALLATION_ID").token()
```

--------------------------------

### Creating an HTTP Client

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part1/index.html

This example demonstrates how to create an HTTP client using http4k to make requests to an external service. It shows a simple GET request.

```kotlin
import org.http4k.client.JavaHttp
import org.http4k.core.Method
import org.http4k.core.Request

val client = JavaHttp()
val request = Request(Method.GET, "https://httpbin.org/get")
val response = client(request)

println(response.status)
println(response.bodyString())
```

--------------------------------

### Making a GET Request with Node.js 'axios'

Source: https://github.com/http4k/http4k.github.io/blob/master/news/documenting_apis_with_openapi/index.html

This snippet shows how to perform a simple GET request using the 'axios' library in Node.js. Ensure 'axios' is installed (`npm install axios`).

```javascript
const axios = require('axios');

async function getExample() {
  try {
    const response = await axios.get('https://jsonplaceholder.typicode.com/posts/1');
    console.log(response.data);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
}

getExample();
```

--------------------------------

### Undertow Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/servers/index.html

A basic example of starting an http4k application with the Undertow server.

```kotlin
import org.http4k.server.Undertow
import org.http4k.server.asServer

fun main() {
    val app = { _: org.http4k.core.Request -> org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, http4k!") }

    app.asServer(Undertow(9000)).start()
}
```

--------------------------------

### Routing with http4k

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/tdding_http4k/part2/index.html

Demonstrates how to define different routes for specific HTTP methods and paths. This example shows handling GET requests to "/" and POST requests to "/echo".

```kotlin
import org.http4k.core.Method.GET
import org.http4k.core.Method.POST
import org.http4k.core.Response
import org.http4k.core.Status.OK
import org.http4k.core.then
import org.http4k.routing.bind
import org.http4k.routing.routes
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = routes(
        "/" bind GET to { Response(OK).body("Hello, World!") },
        "/echo" bind POST to { request -> Response(OK).body(request.bodyString()) }
    )

    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Jetty Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/servers/index.html

A basic example of starting an http4k application with the Jetty server.

```kotlin
import org.http4k.server.Jetty
import org.http4k.server.asServer

fun main() {
    val app = { _: org.http4k.core.Request -> org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, http4k!") }

    app.asServer(Jetty(9000)).start()
}
```

--------------------------------

### Creating a Simple HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/_sites/mcp/index.html

Sets up a basic HTTP server that responds to requests at the root path with a "Hello, World!" message.

```kotlin
import org.http4k.core.HttpHandler\nimport org.http4k.core.Method.GET\nimport org.http4k.core.Response\nimport org.http4k.core.Status.Companion.OK\nimport org.http4k.core.then\nimport org.http4k.filter.DebuggingFilters.PrintRequest\nimport org.http4k.routing.bind\nimport org.http4k.routing.routes\nimport org.http4k.server.Netty\nimport org.http4k.server.asServer\n\nfun main() {\n    val app: HttpHandler = routes(\n        "/" bind GET to { Response(OK).body("Hello, World!") }\n    )\n\n    val printingApp = PrintRequest().then(app)\n\n    val server = printingApp.asServer(Netty(9000)).start()\n    println("Server started on http://localhost:9000")\n    server.stop()\n}
```

--------------------------------

### Handling Different HTTP Methods

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/serverless_http4k_with_aws_lambda/index.html

Example showing how to define routes for different HTTP methods (GET, POST) using http4k's routing capabilities.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Method.POST
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.ServerFilters.CatchAll
import org.http4k.routing.bind
import org.http4k.routing.routes

val app: HttpHandler = CatchAll()
    .then(routes(
        "/" bind GET to { _: Request -> Response(OK).body("GET request received") },
        "/" bind POST to { req: Request -> Response(OK).body("POST request received with body: ${req.bodyString()}") }
    ))

// AWS Lambda handler function (simplified)
fun lambdaHandler(event: Any, context: Any): Any {
    val request = Request(GET, "/") // Mock request
    val response = app(request)
    return mapOf(
        "statusCode" to response.status.code,
        "body" to response.bodyString()
    )
}
```

--------------------------------

### Netty Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/servers/index.html

A basic example of starting an http4k application with the Netty server.

```kotlin
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    val app = { _: org.http4k.core.Request -> org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, http4k!") }

    app.asServer(Netty(9000)).start()
}
```

--------------------------------

### Starting the http4k Server

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/your_first_http4k_app/index.html

This snippet shows how to start the http4k server using the Netty adapter on port 9000 and prints the server port to the console.

```kotlin
val server = printingApp.asServer(Netty(9000)).start()

println("Server started on ${server.port()}")
```

--------------------------------

### Netty Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/servers/index.html

A basic example of starting an http4k application with the Netty server.

```kotlin
import org.http4k.server.Netty
import org.http4k.server.asServer

fun main() {
    MyHttpHandler().asServer(Netty(9000)).start()
}
```

--------------------------------

### Basic Dependency Injection Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/config/index.html

Demonstrates the fundamental setup for dependency injection using http4k's configuration module. This is useful for managing application components and their lifecycles.

```kotlin
import org.http4k.config.Environment
import org.http4k.config.EnvironmentKey
import org.http4k.lens.Lens

// Define environment keys for configuration values
val MY_APP_PORT = EnvironmentKey("MY_APP_PORT", intLens())

// Load environment from properties or system properties
val env = Environment.defaultEnv

// Access configuration values
val port = MY_APP_PORT(env)

println("Application will run on port: $port")
```

--------------------------------

### Create a simple HTTP server

Source: https://github.com/http4k/http4k.github.io/blob/master/company/index.html

Shows how to set up a minimal HTTP server with a single route.

```kotlin
val app: HttpHandler = { request -> Response(OK).body("Hello, World!") }
val server = app.asServer(SunHttp(9000)).start()
// To stop the server: server.stop()
```

--------------------------------

### Scrollspy - Get Offset Height Example

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/use_a_custom_oauth_provider/index.html

Internal method to get the visible height of the scroll element.

```javascript
this._getOffsetHeight()
```

--------------------------------

### Basic HTTP Request Example

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/secure_and_auth_http/index.html

A simple example demonstrating how to make a basic HTTP GET request.

```javascript
const http = require('http');

http.get('http://example.com/data', (res) => {
  let data = '';

  res.on('data', (chunk) => {
    data += chunk;
  });

  res.on('end', () => {
    console.log(data);
  });
}).on('error', (err) => {
  console.error('Error: ' + err.message);
});
```

--------------------------------

### Creating a Simple HTTP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/concepts/http/index.html

Provides an example of setting up a basic HTTP server that responds to requests. This is the foundation for building web services.

```kotlin
import org.http4k.core.HttpHandler
import org.http4k.core.Method.GET
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.server.Netty
import org.http4k.server.asServer

val app: HttpHandler = { request: Request ->
    Response(OK).body("Hello, ${request.method} ${request.uri.path}!")
}

fun main() {
    val server = app.asServer(Netty(9000)).start()
    println("Server started on port ${server.port()}")
}
```

--------------------------------

### Basic MCP App Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/build_a_simple_mcp_app/index.html

Initializes the MCP client and connects to the server. Ensure the server address is correctly configured.

```javascript
import { MCPClient } from '@mcp/client';

const client = new MCPClient('ws://localhost:8080');

client.on('open', () => {
  console.log('Connected to MCP server');
});

client.on('message', (message) => {
  console.log('Received message:', message);
});

client.on('error', (error) => {
  console.error('MCP error:', error);
});

client.on('close', () => {
  console.log('Disconnected from MCP server');
});

// Example of sending a message
setTimeout(() => {
  client.send({ type: 'GREETING', payload: 'Hello from client!' });
}, 2000);
```

--------------------------------

### Basic GET Request

Source: https://github.com/http4k/http4k.github.io/blob/master/showcase/index.html

Demonstrates a simple GET request to a specified URL. No special setup is required.

```kotlin
import org.http4k.client.OkHttp"
import org.http4k.core.Method.GET
import org.http4k.core.Request

val client = OkHttp.client
val request = Request(GET, "https://httpbin.org/get")
val response = client(request)

println(response.status)
println(response.bodyString())

```

--------------------------------

### Basic GraphQL Server Setup

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/graphql/index.html

Demonstrates the minimal setup for a http4k GraphQL server. It requires a GraphQL schema and a HttpHandler.

```kotlin
val schema = GraphQLSchema.newSchema()
    .query(GraphQLObjectType.newObject()
        .name("Query")
        .field { it.name("hello").type(Scalars.GraphQLString).dataFetcher { "world" } })
    .build()

val app: HttpHandler = routes(
    "/graphql" bind Method.POST to GraphQLHandler(schema)
)
```

--------------------------------

### Main Entry Point for MCP Server

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/build_a_simple_mcp_app/index.html

Sets up and starts the MCP server on a specified port using the Jetty server implementation.

```kotlin
package content.tutorial.build_a_simple_mcp_app

import org.http4k.server.Jetty
import org.http4k.server.asServer

fun main() {
    val server = RepoHealthChecker().asServer(Jetty(9000)).start()

    println("Server started on " + server.port())
}
```

--------------------------------

### Serve and Query http4k Application with Jetty and Apache Client

Source: https://github.com/http4k/http4k.github.io/blob/master/howto/use_a_server_backend/index.html

This Kotlin example sets up a simple http4k application, serves it using the embedded Jetty server, and then queries it using the Apache HTTP client. The server is started on port 9000 and the client sends a GET request with a query parameter.

```kotlin
package content.howto.use_a_server_backend

import org.http4k.client.ApacheClient
import org.http4k.core.Method
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.server.Jetty
import org.http4k.server.asServer

fun main() {

    val app = { request: Request -> Response(OK).body("Hello, ${request.query("name")}!") }

    val jettyServer = app.asServer(Jetty(9000)).start()

    val request = Request(Method.GET, "http://localhost:9000").query("name", "John Doe")

    val client = ApacheClient()

    println(client(request))

    jettyServer.stop()
}
```

--------------------------------

### Handling a Simple GET Request

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/your_first_http4k_app/index.html

Demonstrates how to define a route for a GET request to the root path and return a simple "Hello, http4k!" response.

```kotlin
"/" bind GET to { Response(OK).body("Hello, http4k!") }
```

--------------------------------

### Undertow Server Example

Source: https://github.com/http4k/http4k.github.io/blob/master/ecosystem/http4k/reference/servers/index.html

A basic example of starting an http4k application with the Undertow server. Requires the http4k-server-undertow dependency.

```kotlin
import org.http4k.server.Undertow
import org.http4k.server.asServer

fun main() {
    val app = { _: org.http4k.core.Request ->
        org.http4k.core.Response(org.http4k.core.Status.OK).body("Hello, http4k!")
    }

    app.asServer(Undertow(9000)).start()
}
```

--------------------------------

### Starting the Lambda Server

Source: https://github.com/http4k/http4k.github.io/blob/master/tutorial/serverless_http4k_with_aws_lambda/index.html

Starts the http4k application configured for Lambda. The asServer(LambdaHttp).start() method prepares the application for deployment and execution within the AWS Lambda environment.

```kotlin
app.asServer(LambdaHttp).start()
```