为什么Golang将我的POST请求视为GET请求？

Question

我的服务器代码如:

// golang
type SomeHandler struct{}

func (*SomeHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    fmt.Println("method:", req.Method)
    fmt.Println("content length:", req.ContentLength)

    // read request body as []byte
    content, err := ioutil.ReadAll(req.Body)
    if err != nil {
        // do sth.
        return
    }

    // decode JSON
    // ...
}

客户端:

// Objective-C on iOS 6/7
// NSURL *myUrl = ...
NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:myUrl];
[req setHTTPMethod:@"POST"];
[req setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

id obj = @{
             @"username" : @"myname",
             @"password" : @"mypwd",
          };
NSError *error;
NSData *inputJson = [NSJSONSerialization dataWithJSONObject:obj options:0 error:&error];
if (error) {
    // no error here
}
[req setHTTPBody:inputJson];

[NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue]
                       completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

    if (error) {
        NSLog(@"ERROR: %@", error.localizedDescription);
        return;
    }

    NSHTTPURLResponse *resp = (NSHTTPURLResponse *)response;
    NSString *outputText = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"response (%d):\n%@", (int)resp.statusCode, outputText);
}

当我在iPhone模拟器中运行此iOS代码时,服务器端显示:

method: GET
content length: 0

Chage我的客户端代码:[req setHTTPMethod:@"HEAD"];,服务器工作:

method: HEAD
content length: <some length>

我不知道客户端上的POST代码有什么问题,或者我应该在服务器上做什么来检索我的客户端发送的[]字节数据.

顺便说一下,我去的版本:

$ go version
go version go1.2.1 darwin/amd64

Answer 1

我解决了这个!这么奇怪的行为.我不知道为什么会这样.

我注册我的处理程序,如:

// addr := ...
r := mux.NewRouter()
r.Handle("/abc", new(SomeHandler))
http.Handle("/", r)
// here mux is github.com/gorilla/mux
// these lines of code do the same thing as wrote:
//   http.handle("/abc", new(SomeHandler))

err := http.ListenAndServe(addr, nil)
// ...

然后我的客户发送请求说

http://addr:9999//abc

但正确的URL应该是

http://addr:9999/abc

/调用-stringByAppendingString:方法时生成的冗余.