fix(transport): check if body is empty before get Content-Type decoder #3654
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If body is empty, we may not hav Content-Type header, and will return a CODEC error Close go-kratos#3653
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tonybase
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| if !ok { | ||
| return errors.BadRequest("CODEC", fmt.Sprintf("unregister Content-Type: %s", r.Header.Get("Content-Type"))) | ||
| } | ||
| data, err := io.ReadAll(r.Body) |
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If body is empty, we cannot get Content-Type, and will return a CODEC error
Close #3653
Description (what this PR does / why we need it):
默认的http.DefaultRequestDecoder会根据请求的Content-Type获取codec，但是body为空，请求头可能不会携带Content-Type这个header，因此服务会响应
unregister Content-Type:的错误。我把body为空的校验调整到了获取Content-Type之前，避免这种情况出现错误。
Which issue(s) this PR fixes (resolves / be part of):
fixes #3653
Other special notes for the reviewers: