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What type of PR is this?
fix
What this PR does / why we need it (English/Chinese):
en: The error occurred with the 304 status code. The 304 status code is not considered an error per se, as it indicates that the requested resource has not been modified since the last request. However, in HTTP/2, the 304 status code is treated as an error in terms of handling, where it does not allow for a response body to be returned.
zh: 304 状态码返回了 error。304 状态码只是不允许返回 body,不是请求错误,但是在 h2 当中把 304 状态码当作错误处理了。
Which issue(s) this PR fixes: