Called by the server for a request that failed to parse, with what is known about that request.

The default implementation ignores context and delegates to the four-argument handle, so existing handlers keep working unchanged; override this method instead to make use of the context. The parameter is still worth passing for a handler that does not read it, because the arguments of this method are visible to anything instrumenting it: the OpenTelemetry Java agent has to name the span it emits for a rejected request HTTP and report neither http.request.method nor url.path, since the four-argument signature describes only the failure and never the request that caused it. See https://github.com/apache/pekko-http/issues/1245.

Note that DefaultParsingErrorHandler deliberately keeps implementing the four-argument method rather than this one, so that advice matching that signature keeps firing.