http2: provide an error callback and "trace it"#12179
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Getting nghttp2's error message into the trace output helps a user understand what's going on. For example when the connection is brought down due a forbidden header is used - as that header is then not displayed by curl itself. Example: * [HTTP/2] Error: Invalid HTTP header field was received: frame type: 1, stream: 1, name: [upgrade], value: [h2,h2c] Ref: #12172 Closes #12179
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Getting nghttp2's error message into the trace output helps a user understand what's going on. For example when the connection is brought down due a forbidden header is used - as that header is then not displayed by curl itself.
Example:
stream: 1, name: [upgrade], value: [h2,h2c]
Ref: #12172