英文:
Golang: default HTTP client doesn't handle compression
问题
我正在尝试进行一个HTTP请求，并让golang自动添加accept-encoding头部，并在响应被压缩时自动解压缩。我原本以为默认的HTTP客户端应该可以透明地处理这个问题，但实际上并不是这样的：
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
// req.Header.Add("Accept-Encoding", "gzip")
client := &http.Client{}
resp, _ := client.Do(req)
println(resp.Header.Get("Content-Encoding"))
如果我手动添加Accept-Encoding头部，它会发送这个头部，但我仍然需要手动解压缩响应。
英文:
I'm trying to do an HTTP request and have golang add accept-encoding header and decompress the response automatically if it is compressed. I was under the impression that the default HTTP client should handle it transparently? However it doesn't appear to:
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
// req.Header.Add("Accept-Encoding", "gzip")
client := &http.Client{}
resp, _ := client.Do(req)
println(resp.Header.Get("Content-Encoding"))
If I add the Accept-Encoding manually, it sends the header, but I have to uncompress the response manually.
答案1
得分: 5
如果传输请求自己请求gzip并获得了gzip压缩的响应，则响应会被透明地解压缩。在这种情况下，传输会从响应中删除Content-Encoding头部。
检查Response.Uncompressed字段以确定响应是否已解压缩。
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
resp, _ := http.DefaultClient.Do(req)
fmt.Println(resp.Uncompressed) // 输出 true
fmt.Println(resp.Header.Get("Content-Encoding")) // 输出空行
如果应用程序明确请求gzip，则响应将原样返回。
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
req.Header.Add("Accept-Encoding", "gzip")
client := &http.Client{}
resp, _ := client.Do(req)
fmt.Println(resp.Uncompressed) // 输出 false
fmt.Println(resp.Header.Get("Content-Encoding")) // 输出 gzip
英文:
If the Transport requests gzip on its own and gets a gzipped response, then the response is transparently decompressed. The transport removes the Content-Encoding header from the response in this case.
Check the Response. Uncompressed field to determine if the response was uncompressed.
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
resp, _ := http.DefaultClient.Do(req)
fmt.Println(resp.Uncompressed) // prints true
fmt.Println(resp.Header.Get("Content-Encoding")) // prints blank line
If the application explicitly requests gzip, then the response is returned as is.
req, _ := http.NewRequest("Get", "https://stackoverflow.com", nil)
req.Header.Add("Accept-Encoding", "gzip")
client := &http.Client{}
resp, _ := client.Do(req)
fmt.Println(resp.Uncompressed) // prints false
fmt.Println(resp.Header.Get("Content-Encoding")) prints gzip
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