### Install Pigeon HTTP Client

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Installs the Pigeon HTTP client gem using the RubyGems package manager.

```bash
gem install pigeon-http
```

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

### GET Request with Query Parameters

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Demonstrates how to send a GET request with query parameters using the Pigeon HTTP client. Query parameters are only applicable for GET requests.

```ruby
require 'pigeon-http'

param: {
    foo: "bar"
}

client = Pigeon::Client.new('http_request')
response = client.get('https://google.com', query: param)
```

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

### Basic GET Request with Pigeon

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Demonstrates how to create a Pigeon client and perform a basic GET request to a specified URL.

```ruby
require 'pigeon-http'

client = Pigeon::Client.new('http_request')
response = client.get('https://google.com')
```

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

### Configure Pigeon HTTP Client Options

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Shows how to configure Pigeon client with various options such as request timeout, SSL verification, and retry settings. The `http_request` string is used for circuit breaker and Datadog monitoring.

```ruby
options: {
    request_timeout: 60,        # default value
    request_open_timeout: 60,   # default value
    ssl_verify: false,          # default value
}

client = Pigeon::Client.new('http_request', options: options)
response = client.get('https://google.com')
```

```ruby
options: {
    retryable: false,   # default value
    retry_threshold: 3  # default value
}

client = Pigeon::Client.new('http_request', options: options)
response = client.get('https://google.com')
```

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

### POST Request with JSON Payload

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Demonstrates sending a POST request with a JSON payload using the Pigeon HTTP client.

```ruby
require 'pigeon-http'

payload: {
    foo: "bar"
}

client = Pigeon::Client.new('http_request')
response = client.post('https://google.com', body: payload)
```

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

### POST Request with Form Data Payload

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Demonstrates sending a POST request with a multipart form data payload using the Pigeon HTTP client.

```ruby
require 'pigeon-http'

payload: {
    foo: "bar"
}

client = Pigeon::Client.new('http_request')
response = client.post('https://google.com', form: payload)
```

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

### Set Environment Variables for Datadog Integration

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/doc/DATADOG.md

Pigeon-HTTP requires specific environment variables to be set for the Datadog custom metric integration to function correctly. These variables include the StatsD host and port, along with Datadog environment and service names.

```shell
STATSD_HOST=
STATSD_PORT=
DD_ENV=
DD_SERVICE=
```

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

### Initialize Pigeon-HTTP Client with Custom Metric Namespace

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/doc/DATADOG.md

When initializing the Pigeon-HTTP client, you must specify a request name. This name serves as the custom metric namespace in Datadog, allowing you to group related metrics.

```ruby
p = Pigeon::Client.new('http_integration')
```

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

### POST Request with Form URL-encoded Payload

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Demonstrates sending a POST request with a URL-encoded form payload using the Pigeon HTTP client.

```ruby
require 'pigeon-http'

payload: {
    foo: "bar"
}

client = Pigeon::Client.new('http_request')
response = client.post('https://google.com', query: payload)
```

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

### Retry Mechanism Calculation

Source: https://github.com/mekari-engineering/pigeon-http/blob/master/README.md

Explains the backoff time calculation for the retry mechanism in Pigeon, which is 4 raised to the power of the retry counter (n).

```mathematics
4**n
```

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