试图发送POST请求到iOS中的URL

Question

我试图发布到iOS中的网络服务器，但我收到了404错误。我工作人员能够从不同的系统发布在一个字符串的地址和数据：

http://xxx.xxx.xxx.xxx/api/message?salu=mr&firstname=john&lastname=smith&email=smith@testemail.com&country=usa&zipcode=99999&checkbox=y&messagelist=message&q1=1&q2=2&q3=3&q4=4&q5=5

我试图做同样的在Xcode下面的代码：

NSString *body = [NSString stringWithFormat:@"message?salu=mr&firstname=john&lastname=smith&email=matt@testmail.com&country=usa&zipcode=99999&checkbox=y&messagelist=message&q1=1&q2=2&q3=3&q4=4&q5=5"]; 

NSData *data = [body dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 
NSString *postLength = [NSString stringWithFormat:@"%d", [data length]]; 
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api"]]; 
[request setHTTPMethod:@"POST"]; 
[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
[request setHTTPBody:data]; 
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 

NSURLResponse *response; 
NSError *err; 
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err]; 
NSString *reply = [[NSString alloc] initWithBytes:[responseData bytes] length:[responseData length] encoding:NSASCIIStringEncoding]; 
NSLog(@"requestReply: %@", reply);  

，并从上面的NSLog '回复' 的最后几行是：

<b> Description: </b>HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. &nbsp;Please review the following URL and make sure that it is spelled correctly. 
     <br><br> 

     <b> Requested URL: </b>/api<br><br> 

</body> 

但是，我能够用下面的代码，在那里我收到预期的数据放在同一个地址执行“GET”：

NSMutableURLRequest *request2 = [[NSMutableURLRequest alloc] init]; 
[request2 setURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api/message"]]; 
[request2 setHTTPMethod:@"GET"]; 

NSURLResponse *requestResponse; 
NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request2 returningResponse:&requestResponse error:nil]; 

NSString *requestReply = [[NSString alloc] initWithBytes:[requestHandler bytes] length:[requestHandler length] encoding:NSASCIIStringEncoding]; 
NSLog(@"requestReply: %@", requestReply); 

所以Web服务器在运行，它出现问题就出在我发布的方式。有谁知道我做错了什么？

Answer 1

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api"]]; 

你不注意到你应该叫NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api/message"]];

/消息是路径的一部分，而不是请求体。

并期待使用一些现成的框架，比如AFNetworking。

Answer 2

您已将请求的URL的最后一个路径组件message取出，并将其放入请求的正文中。因此，更换：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api"]]; 

与

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xx.xxx.xxx.xxx/api/message"]]; 

而且，替代：

NSString *body = [NSString stringWithFormat:@"message?salu=mr&firstname=john&lastname=smith&email=matt@testmail.com&country=usa&zipcode=99999&checkbox=y&messagelist=message&q1=1&q2=2&q3=3&q4=4&q5=5"]; 

有：

NSString *body = [NSString stringWithFormat:@"salu=mr&firstname=john&lastname=smith&email=matt@testmail.com&country=usa&zipcode=99999&checkbox=y&messagelist=message&q1=1&q2=2&q3=3&q4=4&q5=5"];