POST到服务器会导致GET请求

Question

我正在尝试使用以下代码对服务器执行简单的POST请求：

NSString *post = [[NSString alloc] initWithFormat:@"email=%@&password=%@", self.email.text, ..]; // .. simplified keychainItem 
NSData *postEncoded = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:NO]; 
NSString *postLength = [NSString stringWithFormat:@"%d", [postEncoded length]]; 

NSURL *url = [NSURL URLWithString:@"http://eng.studev.groept.be/web2.0/a11_web02/testApp.php"]; 

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
[request setURL:url]; 
[request setHTTPMethod:@"POST"]; 
[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 
[request setHTTPBody:postEncoded]; 

self.connection = [NSURLConnection connectionWithRequest:request delegate:self];

在服务器上进行调试时，实际上会产生GET请求。这就解释了为什么我在尝试读取$ _POST []变量时遇到PHP错误。一句话：为什么不是setHTTPMethod：被接受？

（额外信息：当在服务器上用PHP编码时，使用POST工作正常）