在NSURLRequest中通过POST发送JSON [英] Sending a JSON via POST in NSURLRequest

问题描述

我在使用REST API向服务器发送JSON时遇到问题。
这是我使用的代码：

I have a problem with sending a JSON to a Server with REST API. This is the code i use:

NSString *jsonPostBody = [NSString stringWithFormat:@"'json' = '{\"user\":{\"username\":"
                          "\"%@\""
                          ",\"password\":"
                          "\"%@\""
                          "}}'",
                          [username stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                          [password stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];       
NSData *postData = [jsonPostBody dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSString *apiPathParams = [NSString stringWithFormat:@"%@",
                           @"getUser"
                           ];

NSURL *url = [NSURL URLWithString:[[apiPath retain] stringByAppendingString:apiPathParams]];    
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                   timeoutInterval:180.0];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:postData];
NSString* postDataLengthString = [[NSString alloc] initWithFormat:@"%d", [postData length]];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:postDataLengthString forHTTPHeaderField:@"Content-Length"];
[self internalRequest:request];

这就是API的样子，如果是html格式：

This is what the API would look like, if it was a html form:

<form method="post" action="someAPI-URL">
<input name="json" value="{"user":...}" />
</form>

这是我将POST数据添加到请求时的样子：

This is what my POST Data looks like when i add it to the request:

json={"user":{"username":"someUser","password":"somePassword"}}

由于某种原因，我不知道POST数据没有到达服务器。
我对dataString的格式化有什么问题吗？
我必须如何格式化我的dataString以便它匹配字符串如上所示的表格将传送到服务器？

For a reason I don't know the POST Data does not arrive at the server. Have i done something wrong with the formatting of the dataString? How exactly must i format my dataString so that it matches the String a form as shown above would deliver to the server?

任何帮助都将受到高度赞赏。

Any help would be highly appreciated.

PS我宁愿不使用ASIHttpRequest，因为我从其他人那里接管了该项目，其他所有请求都正常工作，除了这个post-request。
所以将整个批量更改为其他连接框架将非常耗时。

P.S. I would rather not use ASIHttpRequest, since i took over the project from somebody else an every other request works fine, except this post-request. So changing this whole bulk to an other connection framework would be very time consuming.

这是internalRequest方法的源代码

Here is the internalRequest Method's sourcecode

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:req delegate:self];
NSMutableDictionary *di = [NSMutableDictionary dictionaryWithObject:[[NSMutableData alloc] init] forKey:@"receivedData"];   
[di setObject:[NSString stringWithFormat:@"%i",identifier] forKey:@"identifier"];
if (delegate == nil) 
{ 
    delegate = self;         
}
[di setObject:delegate forKey:@"delegate"];

CFDictionaryAddValue(connectionToInfoMapping, connection, di)

推荐答案

因为您尝试提交HTTP POST标头，例如

since you try to submit a HTTP POST header like

json = {user：{username：％ @，密码：％@}} ，

此示例完全有资格最终混淆。

this example is fully qualified to end up in confusion.

这是整个身体和应用程序的 application / x-www-form-urlencoded 的混合体/ json 代表价值。

It's a mixture of application/x-www-form-urlencoded for the whole body and application/json for the value.

也许可以解决这个问题：

您可能需要调整该HTTP标头：

You'll probably need to adjust that HTTP header:

 [request setValue:@"application/x-www-form-urlencoded" 
forHTTPHeaderField:@"Content-Type"];

由于HTTP主体的JSON部分（值）的编码：

due to an encoding of the JSON part (value) of the HTTP body:

[request setHTTPBody:[[jsonPostBody stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]
                      dataUsingEncoding:NSUTF8StringEncoding 
                   allowLossyConversion:YES]];    

其中 stringByAddingPercentEscapesUsingEncoding 是客观的c jabberwocky PHP等价物 urlencode 。

where stringByAddingPercentEscapesUsingEncoding is objective c jabberwocky for the PHP equivalent urlencode.

HTH

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