[confighttp] Add support for cookies

.chloggen/cookie_support.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: confighttp
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add support for cookies in HTTP clients with `cookies_enabled`.
+
+# One or more tracking issues or pull requests related to the change
+issues: [10175]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: The method `confighttp.ToClient` will return a client with a `cookiejar.Jar` which will reuse cookies from server responses in subsequent requests.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

config/confighttp/README.md

@@ -34,6 +34,7 @@ README](../configtls/README.md).
 - [`disable_keep_alives`](https://golang.org/pkg/net/http/#Transport)
 - [`http2_read_idle_timeout`](https://pkg.go.dev/golang.org/x/net/http2#Transport)
 - [`http2_ping_timeout`](https://pkg.go.dev/golang.org/x/net/http2#Transport)
+- [`cookies_enabled`](https://pkg.go.dev/net/http#CookieJar) if enabled, the client will store cookies from server responses and reuse them in subsequent requests.
 
 Example:
 

config/confighttp/confighttp.go

@@ -11,6 +11,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"net/http/cookiejar"
 	"net/url"
 	"time"
 
@@ -99,6 +100,10 @@ type ClientConfig struct {
 	// HTTP2PingTimeout if there's no response to the ping within the configured value, the connection will be closed.
 	// If not set or set to 0, it defaults to 15s.
 	HTTP2PingTimeout time.Duration `mapstructure:"http2_ping_timeout"`
+
+	// CookiesEnabled enables reusing cookies between requests.
+	// This is useful to manage sticky session cookies.
+	CookiesEnabled bool `mapstructure:"cookies_enabled"`
 }
 
 // NewDefaultClientConfig returns ClientConfig type object with
@@ -227,9 +232,18 @@ func (hcs *ClientConfig) ToClient(ctx context.Context, host component.Host, sett
 		}
 	}
 
+	var jar http.CookieJar
+	if hcs.CookiesEnabled {
+		jar, err = cookiejar.New(nil)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return &http.Client{
 		Transport: clientTransport,
 		Timeout:   hcs.Timeout,
+		Jar:       jar,
 	}, nil
 }
 

config/confighttp/confighttp_test.go

@@ -82,6 +82,7 @@ func TestAllHTTPClientSettings(t *testing.T) {
 				CustomRoundTripper:   func(next http.RoundTripper) (http.RoundTripper, error) { return next, nil },
 				Compression:          "",
 				DisableKeepAlives:    true,
+				CookiesEnabled:       true,
 				HTTP2ReadIdleTimeout: idleConnTimeout,
 				HTTP2PingTimeout:     http2PingTimeout,
 			},