英文:
Golang http.Response gzip writer ERR_CONTENT_LENGTH_MISMATCH
问题
我正在尝试对来自httputil.ReverseProxy的代理响应进行gzip压缩，然后修改响应。所以我只能访问http.Response对象。
res.Body = ioutil.NopCloser(bytes.NewReader(minified))
res.ContentLength = int64(len(minified))
res.Header.Set("Content-Length", strconv.Itoa(len(minified)))
res.Header.Del("Content-Encoding")
这段代码运行良好。但是当我对内容进行gzip压缩时，会出现内容长度不匹配的错误。
var buf bytes.Buffer
gz := gzip.NewWriter(&buf)
gz.Write(minified)
readCloser := ioutil.NopCloser(&buf)
res.Body = readCloser
res.ContentLength = int64(buf.Len())
res.Header.Set("Content-Length", strconv.Itoa(buf.Len()))
res.Header.Set("Content-Encoding", "gzip")
有人能告诉我我做错了什么吗？即使输入发生变化，内容长度始终为10。
英文:
I'm trying to gzip the proxied response from httputil.ReverseProxy -> ModifyResponse.
So I only have access to the http.Response object.
res.Body = ioutil.NopCloser(bytes.NewReader(minified))
res.ContentLength = int64(len(minified))
res.Header.Set("Content-Length", strconv.Itoa(len(minified)))
res.Header.Del("Content-Encoding")
This works just fine. But when I gzip the content I'll get a content-length-mismatch error.
var buf bytes.Buffer
gz := gzip.NewWriter(&buf)
gz.Write(minified)
readCloser := ioutil.NopCloser(&buf)
res.Body = readCloser
res.ContentLength = int64(buf.Len())
res.Header.Set("Content-Length", strconv.Itoa(buf.Len()))
res.Header.Set("Content-Encoding", "gzip")
Can anyone tell what i'm doing wrong? The content-length is always 10 even when the input changes.
答案1
得分: 3
你没有关闭gz写入器，这可能是个问题。gzip.Writer的文档中提到：
当完成写入操作后，调用方有责任调用WriteCloser的Close方法。写入的数据可能会被缓冲并在调用Close方法之前不会被刷新。
因此，在完成数据写入后，尝试添加gz.Close()。
英文:
You're not closing your gz writer. It's possible issue. gzip.Writer documentation says:
> It is the caller's responsibility to call Close on the WriteCloser when done. Writes may be buffered and not flushed until Close.
So, try to add gz.Close() after you've completed writing data.
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