fix: potential memory pressure on server side

This fix changes the default configuration of the HTTP/2 transport to advertise an unlimited value to the peer for SETTINGS_MAX_HEADER_LIST_SIZE (0x6). This configuration basically disables sending the setting at all. So the server uses its default settings.

As some servers like Jetty allocate buffers in size of this setting, this can lead to memory pressure or even OOM errors when the server is not configured properly.

see https://www.ietf.org/archive/id/draft-ietf-httpbis-http2bis-07.html#section-6.5.2-2.11

internal/pkg/http/client.go

@@ -55,14 +55,16 @@ func NewClient(host string, insecure bool, timeoutMilliseconds int, protocol Pro
 	switch protocol {
 	case HTTP2:
 		client.Transport = &http2.Transport{
-			TLSClientConfig: &tls.Config{InsecureSkipVerify: insecure},
+			TLSClientConfig:   &tls.Config{InsecureSkipVerify: insecure},
+			MaxHeaderListSize: 0xffffffff, // avoid sending SETTINGS_MAX_HEADER_LIST_SIZE (0x6) via SETTINGS frame
 		}
 	case H2C:
 		client.Transport = &http2.Transport{
 			AllowHTTP: true,
 			DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
 				return net.Dial(network, addr)
 			},
+			MaxHeaderListSize: 0xffffffff, // avoid sending SETTINGS_MAX_HEADER_LIST_SIZE (0x6) via SETTINGS frame
 		}
 	default:
 		client.Transport = &http.Transport{
@@ -80,7 +82,7 @@ func (c Client) SendRequest(method, path string, headers map[string]string, requ
 	if requestBody != nil {
 		body = bytes.NewBufferString(*requestBody)
 	}
-	
+
 	url := fmt.Sprintf("%s/%s", c.host, strings.TrimLeft(path, "/"))
 	req, err := http.NewRequest(method, url, body)
 	if err != nil {
@@ -89,7 +91,7 @@ func (c Client) SendRequest(method, path string, headers map[string]string, requ
 	}
 	if req.Body != nil {
 		defer req.Body.Close()
-	} 
+	}
 	for k, v := range headers {
 		if strings.EqualFold(k, "Host") {
 			req.Host = v