Issue in json request response, getting blank response - ios

Question

I am stuck with an issue in simple request response in iOS, I am getting blank response in request a url with one post parameter, where the url as it is perfectly working in android and webbrowser
Friends in detail, I have to call
http://example.com/GetCountries
with below http post params
"key"="Abcd1234"
it is working before, but from last few days it is not working, if I check NSError it is showing me The network connection was lost.
and one more thing noticeable here is same server code is on different url and it is working fine, and that url you can test as below
http://example.com/GetCountries
with below http post params
"key"="Abcd1234"
Here is the dropbox link for testing ios source code and also the folder contains Web services test.htm file to test that same url with same post parameter working in browser but not in ios device.
Testing code:
https://dl.dropboxusercontent.com/s/lqrl5b95j2s54mm/Testing.zip?token_hash=AAFgoNfUpQ4FkeswnPdGiMVzdMtSM6js9KySJm_OH6lZXQ&dl=1
thank you

Answer 1

So I could not get the form per se to work but was able to recraft it to work. Note a few things:
you should convert to ARC!
you need a strong reference to the connection so you can release it later on (and not in a delegate method!)
you need the delegate connectionSucceeded method (to record response whatever!)
CODE:
- (void)asynchronousRequest
{
[activity startAnimating];
NSString *requesturl = lblURL.text;
NSLog(#"requesturl=%#", requesturl);
NSURL *theURL = [NSURL URLWithString:requesturl];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setValue:#"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:#"content-type"];
[request setURL:theURL];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setTimeoutInterval:60.0];
[request setHTTPMethod:#"POST"];
NSString *str = [NSString stringWithFormat:#"key=%#", [self URLencodedString:#"Abcd1234"]];
NSLog(#"BODY: %#", str);
NSData *body = [str dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"URL : %#", requesturl);
NSLog(#"REQ : %#", request);
[request setHTTPBody:body];
[request addValue:[NSString stringWithFormat:#"%u", [body length]] forHTTPHeaderField:#"Content-Length"];
NSLog(#"AllFields : %#", [request allHTTPHeaderFields]);
NSLog(#"HTTPBody : %#", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
NSLog(#"HTTPMethod : %#", [request HTTPMethod]);
self.activeDownload = [NSMutableData data];
conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
assert(conn);
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
assert([response isKindOfClass:[NSHTTPURLResponse class]]);
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
NSLog(#"GOT %d", [httpResponse statusCode]);
}
- (NSString *)URLencodedString:(NSString *)s
{
CFStringRef str = CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)s, NULL, (CFStringRef)#"!*'();:#&;=+$,/?%#[]", kCFStringEncodingUTF8);
NSString *newString = [(NSString *)str stringByReplacingOccurrencesOfString:#" " withString:#"+"];
if(str) CFRelease(str);
return newString;
}
EDIT: Modified Code that still didn't work:
- (void)asynchronousRequest
{
[activity startAnimating];
NSString *boundary = #"1010101010"; // DFH no need for the leading '--'
NSString *contentType = [NSString stringWithFormat:#"multipart/form-data; boundary=%#",boundary];
NSMutableDictionary *postVariables = [[NSMutableDictionary alloc] init];
[postVariables setValue:#"Abcd1234" forKey:#"key"];
NSString *requesturl = lblURL.text;
NSMutableString *myStr = [[NSMutableString alloc] init];
NSString *str;
// DFH - strategy is to have each line append its own terminating newline/return
str = [NSString stringWithFormat:#"--%#\r\n",boundary]; // DFH initial boundary
[myStr appendString:str];
NSArray *formKeys = [postVariables allKeys];
for (int i = 0; i < [formKeys count]; i++) {
str = [NSString stringWithFormat:#"Content-Disposition: form-data; name=\"%#\"\r\n%#\r\n",[formKeys objectAtIndex:i],[postVariables valueForKey:[formKeys objectAtIndex:i]]];
[myStr appendString:str];
str = [NSString stringWithFormat:#"--%#\r\n",boundary]; // DFH mid or terminating boundary
[myStr appendString:str];
}
NSLog(#"BODY: %#", myStr);
NSData *body = [myStr dataUsingEncoding:NSUTF8StringEncoding];
requesturl = [self encodeStringForURL:requesturl];
NSLog(#"requesturl=%#", requesturl);
NSURL *theURL = [NSURL URLWithString:requesturl];
self.activeDownload = [NSMutableData data];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:theURL];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setTimeoutInterval:60.0];
[request setHTTPMethod:#"POST"];
[request setValue:contentType forHTTPHeaderField: #"Content-Type"]; // DFH you add addValue, I always use setValue
NSLog(#"URL : %#", requesturl);
NSLog(#"REQ : %#", request);
NSLog(#"ContentType \"%#\"", contentType);
if(body)
{
[request setHTTPBody:body];
}
NSLog(#"AllFields : %#", [request allHTTPHeaderFields]);
NSLog(#"HTTPBody : %#", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
NSLog(#"HTTPMethod : %#", [request HTTPMethod]);
conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
assert(conn);
}

Answer 2

I have used ASIHTTP Library and my problem is solved