英文:
Why Golang treats my POST request as a GET one?
问题
我的服务器代码如下：
// 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
// ...
}
客户端代码如下：
// 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 模拟器上运行这段 iOS 代码时，服务器端显示：
method: GET
content length: 0
将客户端代码更改为 [req setHTTPMethod:@"HEAD"];，服务器端工作正常：
method: HEAD
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：
$ go version
go version go1.2.1 darwin/amd64
英文:
My server code like:
// 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
// ...
}
Client side:
// 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);
}
When I run this iOS code in iPhone simulator the server side shows:
method: GET
content length: 0
Chage my client side code: [req setHTTPMethod:@"HEAD"];, the server works:
method: HEAD
content length: <some length>
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:
$ go version
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：
// addr := ...
r := mux.NewRouter()
r.Handle("/abc", new(SomeHandler))
http.Handle("/", r)
// 这里的mux是github.com/gorilla/mux
// 这些代码行与下面的代码行做的事情是一样的：
// http.handle("/abc", new(SomeHandler))
err := http.ListenAndServe(addr, nil)
// ...
然后我的客户端发送了一个请求，说
http://addr:9999//abc
但正确的URL应该是
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:
// 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)
// ...
Then my client sends a request to say
http://addr:9999//abc
But the correct URL should be
http://addr:9999/abc
The redundant / generated when call -stringByAppendingString: method.
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