为什么 Golang 将我的 POST 请求当作 GET 请求处理？

huangapple
go评论142阅读模式
英文:

Why Golang treats my POST request as a GET one?

问题

我的服务器代码如下：

  1. // golang
  2. type SomeHandler struct{}
  4. func (*SomeHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
  5.     fmt.Println("method:", req.Method)
  6.     fmt.Println("content length:", req.ContentLength)
  8.     // read request body as []byte
  9.     content, err := ioutil.ReadAll(req.Body)
  10.     if err != nil {
  11.         // do sth.
  12.         return
  13.     }
  15.     // decode JSON
  16.     // ...
  17. }

客户端代码如下：

  1. // Objective-C on iOS 6/7
  2. // NSURL *myUrl = ...
  3. NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:myUrl];
  4. [req setHTTPMethod:@"POST"];
  5. [req setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
  7. id obj = @{
  8.              @"username" : @"myname",
  9.              @"password" : @"mypwd",
  10.           };
  11. NSError *error;
  12. NSData *inputJson = [NSJSONSerialization dataWithJSONObject:obj options:0 error:&error];
  13. if (error) {
  14.     // no error here
  15. }
  16. [req setHTTPBody:inputJson];
  18. [NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue]
  19.                        completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
  21.     if (error) {
  22.         NSLog(@"ERROR: %@", error.localizedDescription);
  23.         return;
  24.     }
  26.     NSHTTPURLResponse *resp = (NSHTTPURLResponse *)response;
  27.     NSString *outputText = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  28.     NSLog(@"response (%d):\n%@", (int)resp.statusCode, outputText);
  29. }];

当我在 iPhone 模拟器上运行这段 iOS 代码时，服务器端显示：

  1. method: GET
  2. content length: 0

将客户端代码更改为 [req setHTTPMethod:@"HEAD"];，服务器端工作正常：

  1. method: HEAD
  2. content length: <some length>

我不知道客户端的 POST 代码有什么问题，或者服务器端应该如何获取客户端发送的数据作为 []byte。

另外，我的 Go 版本是：

  1. $ go version
  2. go version go1.2.1 darwin/amd64
英文:

My server code like:

  1. // golang
  2. type SomeHandler struct{}
  4. func (*SomeHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
  5.     fmt.Println(&quot;method:&quot;, req.Method)
  6.     fmt.Println(&quot;content length:&quot;, req.ContentLength)
  8.     // read request body as []byte
  9.     content, err := ioutil.ReadAll(req.Body)
  10.     if err != nil {
  11.         // do sth.
  12.         return
  13.     }
  15.     // decode JSON
  16.     // ...
  17. }

Client side:

  1. // Objective-C on iOS 6/7
  2. // NSURL *myUrl = ...
  3. NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:myUrl];
  4. [req setHTTPMethod:@&quot;POST&quot;];
  5. [req setValue:@&quot;application/json; charset=utf-8&quot; forHTTPHeaderField:@&quot;Content-Type&quot;];
  7. id obj = @{
  8.              @&quot;username&quot; : @&quot;myname&quot;,
  9.              @&quot;password&quot; : @&quot;mypwd&quot;,
  10.           };
  11. NSError *error;
  12. NSData *inputJson = [NSJSONSerialization dataWithJSONObject:obj options:0 error:&amp;error];
  13. if (error) {
  14.     // no error here
  15. }
  16. [req setHTTPBody:inputJson];
  18. [NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue]
  19.                        completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
  21.     if (error) {
  22.         NSLog(@&quot;ERROR: %@&quot;, error.localizedDescription);
  23.         return;
  24.     }
  26.     NSHTTPURLResponse *resp = (NSHTTPURLResponse *)response;
  27.     NSString *outputText = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  28.     NSLog(@&quot;response (%d):\n%@&quot;, (int)resp.statusCode, outputText);
  29. }

When I run this iOS code in iPhone simulator the server side shows:

  1. method: GET
  2. content length: 0

Chage my client side code: [req setHTTPMethod:@&quot;HEAD&quot;];, the server works:

  1. method: HEAD
  2. content length: &lt;some length&gt;

I don't know what's wrong with my POST code on the client or what should I do on the server to retrieve data as []byte my client just sent.

btw,
my go version:

  1. $ go version
  2. go version go1.2.1 darwin/amd64

答案1

得分: 8

我解决了！如此奇怪的行为。我不知道为什么会发生这种情况。

我注册了我的处理程序，像这样：

  1. // addr := ...
  2. r := mux.NewRouter()
  3. r.Handle("/abc", new(SomeHandler))
  4. http.Handle("/", r)
  5. // 这里的mux是github.com/gorilla/mux
  6. // 这些代码行与下面的代码行做的事情是一样的：
  7. //   http.handle("/abc", new(SomeHandler))
  9. err := http.ListenAndServe(addr, nil)
  10. // ...

然后我的客户端发送了一个请求，说

  1. http://addr:9999//abc

但正确的URL应该是

  1. http://addr:9999/abc

在调用-stringByAppendingString:方法时产生了多余的/。

英文:

I solved this! So strange behavior. I don't know why this could happen.

I register my handler like:

  1. // addr := ...
  2. r := mux.NewRouter()
  3. r.Handle(&quot;/abc&quot;, new(SomeHandler))
  4. http.Handle(&quot;/&quot;, r)
  5. // here mux is github.com/gorilla/mux
  6. // these lines of code do the same thing as wrote:
  7. //   http.handle(&quot;/abc&quot;, new(SomeHandler))
  9. err := http.ListenAndServe(addr, nil)
  10. // ...

Then my client sends a request to say

  1. http://addr:9999//abc

But the correct URL should be

  1. http://addr:9999/abc

The redundant / generated when call -stringByAppendingString: method.

huangapple
  • 本文由 发表于 2014年5月5日 09:38:05
  • 转载请务必保留本文链接：https://go.coder-hub.com/23463601.html
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