How to send POST and GET request?

Question

I want to send my JSON to a URL (POST and GET).

NSMutableDictionary *JSONDict = [[NSMutableDictionary alloc] init]; [JSONDict setValue:"myValue" forKey:"myKey"];  NSData *JSONData = [NSJSONSerialization dataWithJSONObject:self options:kNilOptions error:nil]; 

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My current request code isn't working.

NSMutableURLRequest *requestData = [[NSMutableURLRequest alloc] init];  [requestData setURL:[NSURL URLWithString:@"http://fake.url/"];];  [requestData setHTTPMethod:@"POST"]; [requestData setValue:postLength forHTTPHeaderField:@"Content-Length"]; [requestData setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [requestData setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [requestData setHTTPBody:postData]; 

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Using ASIHTTPRequest is not a liable answer.

Answer 1

Sending POST and GET requests in iOS is quite easy; and there's no need for an additional framework.

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POST Request:

We begin by creating our POST's body (ergo. what we'd like to send) as an NSString, and converting it to NSData.

objective-c

NSString *post = [NSString stringWithFormat:@"test=Message&this=isNotReal"]; NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 

Next up, we read the postData's length, so we can pass it along in the request.

NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; 

Now that we have what we'd like to post, we can create an NSMutableURLRequest, and include our postData.

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setURL:[NSURL URLWithString:@"http://YourURL.com/FakeURL"]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setHTTPBody:postData]; 

swift

let post = "test=Message&this=isNotReal" let postData = post.data(using: String.Encoding.ascii, allowLossyConversion: true)  let postLength = String(postData!.count)  var request = URLRequest(url: URL(string: "http://YourURL.com/FakeURL/PARAMETERS")!) request.httpMethod = "POST" request.addValue(postLength, forHTTPHeaderField: "Content-Length") request.httpBody = postData; 

And finally, we can send our request, and read the reply by creating a new NSURLSession:

objective-c

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]]; [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {     NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];     NSLog(@"Request reply: %@", requestReply); }] resume]; 

swift

let session = URLSession(configuration: .default) session.dataTask(with: request) {data, response, error in     let requestReply = NSString(data: data!, encoding: String.Encoding.ascii.rawValue)     print("Request reply: \(requestReply!)") }.resume() 

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GET Request:

With the GET request it's basically the same thing, only without the HTTPBody and Content-Length.

objective-c

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setURL:[NSURL URLWithString:@"http://YourURL.com/FakeURL/PARAMETERS"]]; [request setHTTPMethod:@"GET"];  NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]]; [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {     NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];     NSLog(@"Request reply: %@", requestReply); }] resume]; 

swift

var request = URLRequest(url: URL(string: "http://YourURL.com/FakeURL/PARAMETERS")!) request.httpMethod = "GET"  let session = URLSession(configuration: .default) session.dataTask(with: request) {data, response, error in     let requestReply = NSString(data: data!, encoding: String.Encoding.ascii.rawValue)     print("Request reply: \(requestReply!)") }.resume() 

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On a side note, you can add Content-Type (and other data) by adding the following to our NSMutableURLRequest. This might be required by the server when requesting, e.g, a json.

objective-c

[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 

Response code can also be read using [(NSHTTPURLResponse*)response statusCode].

swift

request.addValue("application/json", forHTTPHeaderField: "Content-Type") request.addValue("application/json", forHTTPHeaderField: "Accept") 

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Update: sendSynchronousRequest is deprecated from ios9 and osx-elcapitan (10.11) and out.

NSURLResponse *requestResponse; NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:nil]; NSString *requestReply = [[NSString alloc] initWithBytes:[requestHandler bytes] length:[requestHandler length] encoding:NSASCIIStringEncoding]; NSLog(@"requestReply: %@", requestReply);