I\'m trying to send an HTTP Post with the iOS application that I\'m developing but the push never reaches the server although I do get a code 200 as response (from the urlco
Sending an HTTP POST request on iOS (Objective c):
-(NSString *)postexample{
// SEND POST
NSString *url = [NSString stringWithFormat:@"URL"];
NSString *post = [NSString stringWithFormat:@"param=value"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod:@"POST"];
[request setURL:[NSURL URLWithString:url]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSError *error = nil;
NSHTTPURLResponse *responseCode = nil;
//RESPONDE DATA
NSData *oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseCode error:&error];
if([responseCode statusCode] != 200){
NSLog(@"Error getting %@, HTTP status code %li", url, (long)[responseCode statusCode]);
return nil;
}
//SEE RESPONSE DATA
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Response" message:[[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
return [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];
}
-(void)sendingAnHTTPPOSTRequestOniOSWithUserEmailId: (NSString *)emailId withPassword: (NSString *)password{
//Init the NSURLSession with a configuration
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
//Create an URLRequest
NSURL *url = [NSURL URLWithString:@"http://www.example.com/apis/login_api"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
//Create POST Params and add it to HTTPBody
NSString *params = [NSString stringWithFormat:@"email=%@&password=%@",emailId,password];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
//Create task
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//Handle your response here
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSLog(@"%@",responseDict);
}];
[dataTask resume];
}
I am not really sure why, but as soon as I comment out the following method it works:
connectionDidFinishDownloading:destinationURL:
Furthermore, I don't think you need the methods from the NSUrlConnectionDownloadDelegate protocol, only those from NSURLConnectionDataDelegate, unless you want some download information.
The following code describes a simple example using POST
method.(How one can pass data by POST
method)
Here, I describe how one can use of POST method.
1. Set post string with actual username and password.
NSString *post = [NSString stringWithFormat:@"Username=%@&Password=%@",@"username",@"password"];
2. Encode the post string using NSASCIIStringEncoding
and also the post string you need to send in NSData format.
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
You need to send the actual length of your data. Calculate the length of the post string.
NSString *postLength = [NSString stringWithFormat:@"%d",[postData length]];
3. Create a Urlrequest with all the properties like HTTP
method, http header field with length of the post string. Create URLRequest
object and initialize it.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
Set the Url for which your going to send the data to that request.
[request setURL:[NSURL URLWithString:@"http://www.abcde.com/xyz/login.aspx"]];
Now, set HTTP method (POST or GET). Write this lines as it is in your code.
[request setHTTPMethod:@"POST"];
Set HTTP
header field with length of the post data.
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
Also set the Encoded value for HTTP header Field.
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
Set the HTTPBody
of the urlrequest with postData.
[request setHTTPBody:postData];
4. Now, create URLConnection object. Initialize it with the URLRequest.
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
It returns the initialized url connection and begins to load the data for the url request. You can check that whether you URL
connection is done properly or not using just if/else statement as below.
if(conn) {
NSLog(@"Connection Successful");
} else {
NSLog(@"Connection could not be made");
}
5. To receive the data from the HTTP request , you can use the delegate methods provided by the URLConnection Class Reference. Delegate methods are as below.
// This method is used to receive the data which we get using post method.
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
// This method receives the error report in case of connection is not made to server.
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
// This method is used to process the data after connection has made successfully.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
Also Refer This and This documentation for POST
method.
And here is best example with source code of HTTPPost Method.
Using Swift 3 or 4 you can access these http request for sever communication.
// For POST data to request
func postAction() {
//declare parameter as a dictionary which contains string as key and value combination. considering inputs are valid
let parameters = ["id": 13, "name": "jack"] as [String : Any]
//create the url with URL
let url = URL(string: "www.requestURL.php")! //change the url
//create the session object
let session = URLSession.shared
//now create the URLRequest object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
do {
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
} catch let error {
print(error.localizedDescription)
}
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//create dataTask using the session object to send data to the server
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print(json)
// handle json...
}
} catch let error {
print(error.localizedDescription)
}
})
task.resume() }
// For get the data from request
func GetRequest() {
let urlString = URL(string: "http://www.requestURL.php") //change the url
if let url = urlString {
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error ?? "")
} else {
if let responceData = data {
print(responceData) //JSONSerialization
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with:responceData, options: .mutableContainers) as? [String: Any] {
print(json)
// handle json...
}
} catch let error {
print(error.localizedDescription)
}
}
}
}
task.resume()
}
}
// For get the download content like image or video from request
func downloadTask() {
// Create destination URL
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
let destinationFileUrl = documentsUrl.appendingPathComponent("downloadedFile.jpg")
//Create URL to the source file you want to download
let fileURL = URL(string: "http://placehold.it/120x120&text=image1")
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL!)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Successfully downloaded. Status code: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
} catch (let writeError) {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
}
} else {
print("Error took place while downloading a file. Error description: %@", error?.localizedDescription ?? "");
}
}
task.resume()
}
Objective C
Post API with parameters and validate with url to navigate if json
response key with status:"success"
NSString *string= [NSString stringWithFormat:@"url?uname=%@&pass=%@&uname_submit=Login",self.txtUsername.text,self.txtPassword.text];
NSLog(@"%@",string);
NSURL *url = [NSURL URLWithString:string];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
NSLog(@"responseData: %@", responseData);
NSString *str = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(@"responseData: %@", str);
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData
options:kNilOptions
error:nil];
NSDictionary* latestLoans = [json objectForKey:@"status"];
NSString *str2=[NSString stringWithFormat:@"%@", latestLoans];
NSString *str3=@"success";
if ([str3 isEqualToString:str2 ])
{
[self performSegueWithIdentifier:@"move" sender:nil];
NSLog(@"successfully.");
}
else
{
UIAlertController *alert= [UIAlertController
alertControllerWithTitle:@"Try Again"
message:@"Username or Password is Incorrect."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action){
[self.view endEditing:YES];
}
];
[alert addAction:ok];
[[UIView appearanceWhenContainedIn:[UIAlertController class], nil] setTintColor:[UIColor redColor]];
[self presentViewController:alert animated:YES completion:nil];
[self.view endEditing:YES];
}
JSON Response : {"status":"success","user_id":"58","user_name":"dilip","result":"You have been logged in successfully"} Working code
**