检测gzip编码以手动解压缩响应,但是缺少"Content-Encoding"标头 [英] Detect gzip encoding to manually decompress response, but 'Content-Encoding' header missing
问题描述
我正在'Go'中使用net/http
库发出HTTP GET
请求.在响应中,我得到12个标题.但是,当我通过邮递员运行完全相同的查询时,我得到了16个标头.缺少的内容之一是内容编码".我了解这一定是 CORS 问题.
I am using net/http
library in 'Go' to make an HTTP GET
request. In the response, i get 12 headers. But when i run the exact same query through postman, i get 16 headers. One of those missing is 'Content-Encoding'. I understand this must be a CORS issue.
但是由于我尚未在请求中设置标头Accept-Encoding: gzip
,并且仍在响应中获取gzip编码,因此Go传输不是
But since i have not set the header Accept-Encoding: gzip
in my request, and i am still getting the gzip encoding in response, the Go transport is not automatically decompressing the response for me. So, i need to be able to manually detect the encoding and then decompress it. But, i cannot detect if the 'Content-Encoding' header is missing in the response.
这是我尝试执行此操作的代码:
Here is my code where i try to do this:
func calcDistanceAndDurationWithUberApi(originLat float64, originLon float64, destinationLat float64, destinationLon float64) (float64, float64, error) {
endpoint := "https://api.uber.com/v1.2/estimates/price"
parameters := fmt.Sprintf("?start_latitude=%v&start_longitude=%v&end_latitude=%v&end_longitude=%v", originLat, originLon, destinationLat, destinationLon)
req, err := http.NewRequest("GET", endpoint + parameters, nil)
if err != nil {
return 0, 0, err
}
req.Header.Add("Authorization", "Token " + getUberApiKey())
req.Header.Add("Accept-Language", "en_US")
req.Header.Add("Content-Type", "application/json")
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
return 0, 0, err
}
if resp.StatusCode != 200 {
return 0, 0, errors.NotFound("Response: %v", resp.StatusCode)
}
defer resp.Body.Close()
pretty.Println("- REQUEST: ")
pretty.Println(req)
// Check if server sent gzipped response. Decompress if yes.
var respReader io.ReadCloser
switch resp.Header.Get("Content-Encoding") {
case "gzip":
fmt.Println("Content-Encoding is gzip")
respReader, err = gzip.NewReader(resp.Body)
defer respReader.Close()
default:
fmt.Println("Content-Encoding is Not gzip")
respReader = resp.Body
}
pretty.Println("- RESPONSE HEADER: ")
pretty.Println(resp.Header)
pretty.Println("- RESPONSE BODY: ")
pretty.Println(respReader)
return 0, 0, nil
}
响应状态为"200 OK".这是输出(响应):
The response status is '200 OK'. Here is the output (Response):
- RESPONSE HEADER:
http.Header{
"Content-Language": {"en"},
"Cache-Control": {"max-age=0"},
"X-Uber-App": {"uberex-nonsandbox", "optimus"},
"Strict-Transport-Security": {"max-age=604800", "max-age=2592000"},
"X-Content-Type-Options": {"nosniff"},
"Date": {"Fri, 19 May 2017 07:52:17 GMT"},
"Content-Geo-System": {"wgs-84"},
"Connection": {"keep-alive"},
"X-Frame-Options": {"SAMEORIGIN"},
"X-Xss-Protection": {"1; mode=block"},
"Server": {"nginx"},
"Content-Type": {"application/json"},
}
- RESPONSE BODY:
&http.gzipReader{
body: &http.bodyEOFSignal{
body: &http.body{
src: &internal.chunkedReader{
r: &bufio.Reader{
buf: {0x48, 0x54, .......... }
推荐答案
我屈服于uber api的顽固性,并添加了另一个请求标头req.Header.Add("Accept-Encoding", "gzip")
.
I gave in to the stubbornness of the uber api and added another request header, req.Header.Add("Accept-Encoding", "gzip")
.
现在,我得到的是响应标头"Content-Encoding": "gzip"
,尽管我仍然得到了无法理解的响应正文,但这超出了此问题的范围.
Now i am getting the response header "Content-Encoding": "gzip"
, although i am still getting an undecipherable response body, but that's beyond the scope of this question.
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