fix(internal): silence unsolicited response log lines

Signed-off-by: Xe Iaso <me@xeiaso.net>

docs/docs/CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The contact email in the LibreJS header has been changed.
 - The hard dependency on WebCrypto has been removed, allowing a proof of work challenge to work over plain (unencrypted) HTTP.
 - The legacy JSON based policy file example has been removed and all documentation for how to write a policy file in JSON has been deleted. JSON based policy files will still work, but YAML is the superior option for Anubis configuration.
+- A standard library HTTP server log message about HTTP pipelining not working has been filtered out of Anubis' logs. There is no action that can be taken about it.
 
 ### Breaking changes
 

internal/log.go

@@ -50,6 +50,9 @@ func (elf *ErrorLogFilter) Write(p []byte) (n int, err error) {
 	if strings.Contains(logMessage, "context canceled") {
 		return len(p), nil // Suppress the log by doing nothing
 	}
+	if strings.Contains(logMessage, "Unsolicited response received on idle HTTP channel") {
+		return len(p), nil
+	}
 	if elf.Unwrap != nil {
 		return elf.Unwrap.Writer().Write(p)
 	}