HTTP/2 should send a reset of NO_ERROR instead of CANCEL if already sent response headers

[maxbear1988]

I write a proxy service that use hyper.I upload a file by chrome browser use http2 to my proxy service.In my proxy service，i check the file size by request header content-length and find it is too large, i retrun response with status code 413 without reading the request body immediately.chrome report ERR_HTTP2_PROTOCOL_ERROR, but it is ok in http1.1.
I read http2.0 protocol rfc7540 and find program should send RST_STREAM frame with an error code of NO ERROR after sending a complete response.
Does hyper provide a solution to this problem?How to solve the problem？

[seanmonstar]

hyper does send a reset frame after you've responded and dropped the request body without reading.

The error seems to suggest it's related to SSL, not to HTTP/2.

[maxbear1988]

@seanmonstar thank you. i don't think it is related to SSL. It it performance well in http1.1；if i read the request body，it performance well in http2.0,too. Does hyper send a reset frame with an error code of NO ERROR already？in which version？i don‘t see this code by searching keyword send_reset？I only find send_reset(h2::Reason::INTERNAL_ERROR)

[seanmonstar]

The automatic sending of a reset is handled in h2, a dependency of hyper.

[maxbear1988]

@seanmonstar chrome report ERR_HTTP2_PROTOCOL_ERROR ，not ERR_SSL_PROTOCOL_ERROR ，i wrote error last time

[seanmonstar]

Does this happen with other clients? Firefox? curl? Some other language client?

[maxbear1988]

@seanmonstar yes，i try chrome，firefox，Microsoft Edge，all report ERR_HTTP2_PROTOCOL_ERROR

[maxbear1988]

@seanmonstar if i read all request body, then response status code 413, it is ok. if i response status code 413 without reading request body, it is not ok.I think hyper should send RST_STREAM frame with error code of NO ERROR after respone status code 413 without waiting for all request body.

[maxbear1988]

@seanmonstar i open hyper trace log，hyper send reset frame with error_code CANCEL. FramedWrite::buffer�[0m�[1m{�[0mframe=Reset { stream_id: StreamId(647), error_code: CANCEL

[seanmonstar]

Ah, I see. So currently, if you drop all handles to the stream while there is still things to read, it will automatically send a reset of CANCEL. The h2 library should be updated to check if (a) we are the server, and (b) if response headers have already been sent, then change to sending a reset of NO_ERROR instead.

[maxbear1988]

@seanmonstar do you have a plan to fix this issue?