### Install slog-http Go Module

Source: https://github.com/samber/slog-http/blob/main/README.md

Installs the slog-http Go module using the `go get` command. This command fetches the module from its repository and adds it to your Go workspace, making it available for import and use in your Go projects.

```Shell
go get github.com/samber/slog-http
```

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

### Implement Basic slog-http Middleware

Source: https://github.com/samber/slog-http/blob/main/README.md

Demonstrates a minimal setup for `slog-http` middleware with a standard Go HTTP server. This example shows how to initialize a `slog` logger, define basic HTTP routes, and apply `slog-http`'s `Recovery` and `New` logging middleware to handle requests and log their details, including an example of the output format.

```go
import (
	"net/http"
	os"
	"time"

	sloghttp "github.com/samber/slog-http"
	"log/slog"
)

// Create a slog logger, which:
//   - Logs to stdout.
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// mux router
mux := http.NewServeMux()

// Routes
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello, World!"))
}))
mux.Handle("/error", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	http.Error(w,  "I'm angry" http.StatusInternalServerError)
}))

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.New(logger)(handler)

// Start server
http.ListenAndServe(":4242", handler)

// output:
// time=2023-10-15T20:32:58.926+02:00 level=INFO msg="Success" env=production request.time=2023-10-15T20:32:58.626+02:00 request.method=GET request.path=/ request.route="" request.ip=127.0.0.1:63932 request.length=0 response.time=2023-10-15T20:32:58.926+02:00 response.latency=100ms response.status=200 response.length=7 id=229c7fc8-64f5-4467-bc4a-940700503b0d
```

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

### Development and testing commands for Go slog-http

Source: https://github.com/samber/slog-http/blob/main/README.md

Provides common development commands for the `slog-http` project, including installing development dependencies and running unit tests. These commands are typically executed via `make`.

```bash
# Install some dev dependencies
make tools

# Run tests
make test
# or
make watch-test
```

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

### Apply Custom Logging Filters to HTTP Requests

Source: https://github.com/samber/slog-http/blob/main/README.md

Illustrates the use of `slog-http` filters to selectively log or ignore HTTP requests based on custom logic or predefined criteria. This example shows how to use a custom `Accept` filter and the `IgnoreStatus` filter to exclude specific status codes from logging.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

mux := http.NewServeMux()

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.NewWithFilters(
	logger,
	sloghttp.Accept(func (w sloghttp.WrapResponseWriter, r *http.Request) bool {
		return xxx
	}),
	sloghttp.IgnoreStatus(401, 404),
)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Apply Go slog-http middleware with a logger subgroup

Source: https://github.com/samber/slog-http/blob/main/README.md

Illustrates how to configure `slog-http` middleware to use a `slog` logger with a predefined subgroup (e.g., 'http'). This groups all HTTP-related log attributes under a common key, improving log readability and organization. It sets up a basic HTTP server with routes and applies the logging and recovery middleware.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// mux router
mux := http.NewServeMux()

// Routes
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello, World!"))
}))
mux.Handle("/error", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	http.Error(w,  "I'm angry" http.StatusInternalServerError)
}))

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.New(logger.WithGroup("http"))(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Enable Verbose Request and Response Logging

Source: https://github.com/samber/slog-http/blob/main/README.md

Demonstrates how to configure `slog-http` to log detailed request and response information, including full bodies and headers. This is achieved by enabling `WithRequestBody`, `WithResponseBody`, `WithRequestHeader`, and `WithResponseHeader` options in the `Config` struct, useful for debugging and auditing.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

config := sloghttp.Config{
	WithRequestBody: true,
	WithResponseBody: true,
	WithRequestHeader: true,
	WithResponseHeader: true,
}

mux := http.NewServeMux()

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.NewWithConfig(logger, config)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Configure Go slog-http middleware with custom time formatting

Source: https://github.com/samber/slog-http/blob/main/README.md

Demonstrates how to initialize `slog-http` middleware with a custom `slog` logger that uses `slog-formatter` to apply specific time formats (RFC3339 UTC) to log entries. It sets up a basic HTTP server with routes and applies the logging and recovery middleware, showing the effect on the log output.

```go
import (
	"net/http"
	"log/slog"

	sloghttp "github.com/samber/slog-http"
	slogformatter "github.com/samber/slog-formatter"
)

// Create a slog logger, which:
//   - Logs to stdout.
//   - RFC3339 with UTC time format.
logger := slog.New(
	slogformatter.NewFormatterHandler(
		slogformatter.TimezoneConverter(time.UTC),
		slogformatter.TimeFormatter(time.DateTime, nil),
	)(
		slog.NewTextHandler(os.Stdout, nil),
	),
)

// mux router
mux := http.NewServeMux()

// Routes
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello, World!"))
}))
mux.Handle("/error", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	http.Error(w, "I'm angry" http.StatusInternalServerError)
}))

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.New(logger)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Configure Go slog-http for JSON log output

Source: https://github.com/samber/slog-http/blob/main/README.md

Demonstrates how to configure the `slog-http` middleware to produce log output in JSON format. This is achieved by initializing the underlying `slog` logger with `slog.NewJSONHandler`, which is suitable for structured logging and integration with log aggregation systems.

```go
logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))

// mux router
mux := http.NewServeMux()

// Routes
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("Hello, World!"))
}))

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.New(logger)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Configure Global slog-http Parameters

Source: https://github.com/samber/slog-http/blob/main/README.md

Sets global parameters for the `slog-http` library, including keys for trace and span IDs, maximum request/response body sizes, and lists of hidden headers for sensitive information. These parameters affect the behavior of the middleware globally across all instances.

```go
sloghttp.TraceIDKey = "trace_id"
sloghttp.SpanIDKey = "span_id"
sloghttp.RequestBodyMaxSize  = 64 * 1024 // 64KB
sloghttp.ResponseBodyMaxSize = 64 * 1024 // 64KB
sloghttp.HiddenRequestHeaders = map[string]struct{}{ ... }
sloghttp.HiddenResponseHeaders = map[string]struct{}{ ... }
sloghttp.RequestIDHeaderKey = "X-Request-Id"
```

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

### Integrate Go slog-http middleware on a specific HTTP route

Source: https://github.com/samber/slog-http/blob/main/README.md

Shows how to apply the `slog-http` middleware to an individual HTTP route rather than globally. This allows for fine-grained control over logging, enabling specific routes to have their own logger configurations or to be logged independently.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// mux router
mux := http.NewServeMux()

// Routes
mux.Handler("/", sloghttp.New(logger)(
	http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			return c.String(http.StatusOK, "Hello, World!")
		},
	),
	sloghttp.New(logger),
))

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Define slog-http Configuration Structure

Source: https://github.com/samber/slog-http/blob/main/README.md

Defines the `Config` struct for `slog-http` middleware, allowing customization of log levels for different HTTP response categories (default, client error, server error), and inclusion of various request/response attributes like user agent, request ID, body, headers, and OpenTelemetry trace/span IDs.

```go
type Config struct {
	DefaultLevel     slog.Level
	ClientErrorLevel slog.Level
	ServerErrorLevel slog.Level

	WithUserAgent      bool
	WithRequestID      bool
	WithRequestBody    bool
	WithRequestHeader  bool
	WithResponseBody   bool
	WithResponseHeader bool
	WithSpanID         bool
	WithTraceID        bool

	Filters []Filter
}
```

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

### Integrate slog-http with OpenTelemetry

Source: https://github.com/samber/slog-http/blob/main/README.md

Illustrates how to configure `slog-http` to automatically include OpenTelemetry trace and span IDs in logs. This is achieved by setting `WithSpanID` and `WithTraceID` to `true` in the `Config` struct, enabling correlation of logs with distributed traces for enhanced observability.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

config := sloghttp.Config{
	WithSpanID:  true,
	WithTraceID: true,
}

mux := http.NewServeMux()

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.NewWithConfig(logger, config)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Add custom attributes to Go slog-http log entries

Source: https://github.com/samber/slog-http/blob/main/README.md

Explains how to dynamically add custom attributes to log entries within an HTTP request handler using `sloghttp.AddCustomAttributes`. This allows for context-specific data to be included in logs, such as user IDs, transaction IDs, or other request-specific details. It also demonstrates adding a global attribute to the logger.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

// Add an attribute to all log entries made through this logger.
logger = logger.With("env", "production")

// mux router
mux := http.NewServeMux()

// Routes
mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	sloghttp.AddCustomAttributes(r, slog.String("foo", "bar"))
	w.Write([]byte("Hello, World!"))
}))

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.New(logger)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### Configure Custom Log Levels for HTTP Statuses

Source: https://github.com/samber/slog-http/blob/main/README.md

Shows how to customize log levels for different HTTP response categories (default, client errors, server errors) using the `DefaultLevel`, `ClientErrorLevel`, and `ServerErrorLevel` fields in the `slog-http` configuration. This allows fine-grained control over log verbosity based on response outcomes.

```go
logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

config := sloghttp.Config{
	DefaultLevel:     slog.LevelInfo,
	ClientErrorLevel: slog.LevelWarn,
	ServerErrorLevel: slog.LevelError,
}

mux := http.NewServeMux()

// Middleware
handler := sloghttp.Recovery(mux)
handler = sloghttp.NewWithConfig(logger, config)(handler)

// Start server
http.ListenAndServe(":4242", handler)
```

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

### slog-http Available Filtering Options

Source: https://github.com/samber/slog-http/blob/main/README.md

Lists the various built-in filtering options provided by `slog-http` for controlling which HTTP requests are logged. These filters allow conditional logging based on methods, status codes, paths, and hosts, offering granular control over log output.

```APIDOC
Available filters:
- Accept / Ignore
- AcceptMethod / IgnoreMethod
- AcceptStatus / IgnoreStatus
- AcceptStatusGreaterThan / IgnoreStatusGreaterThan
- AcceptStatusLessThan / IgnoreStatusLessThan
- AcceptStatusGreaterThanOrEqual / IgnoreStatusGreaterThanOrEqual
- AcceptStatusLessThanOrEqual / IgnoreStatusLessThanOrEqual
- AcceptPath / IgnorePath
- AcceptPathContains / IgnorePathContains
- AcceptPathPrefix / IgnorePathPrefix
- AcceptPathSuffix / IgnorePathSuffix
- AcceptPathMatch / IgnorePathMatch
- AcceptHost / IgnoreHost
- AcceptHostContains / IgnoreHostContains
- AcceptHostPrefix / IgnoreHostPrefix
- AcceptHostSuffix / IgnoreHostSuffix
- AcceptHostMatch / IgnoreHostMatch
```

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