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NSData *finalData = [NSJSONSerialization dataWithJSONObject:mainDictionary options:NSJSONWritingPrettyPrinted error:nil];

//Calculate data length to post
NSString *postLength = [NSString stringWithFormat:@"%d", [finalData length]];

NSString *str2 =[[NSString alloc] initWithData:finalData encoding:NSUTF8StringEncoding];
NSLog(@"Final Json : %@",str2);

 NSString *urlString=[NSString stringWithFormat:@"%@%@",BASE_URL,EXT_URL];
NSMutableURLRequest *theRequest=[NSMutableURLRequest
                                 requestWithURL:[NSURL URLWithString:
                                                 urlString]
                                 cachePolicy:NSURLRequestUseProtocolCachePolicy
                                 timeoutInterval:60.0];

[theRequest setHTTPMethod:@"POST"];
[theRequest addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[theRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPBody:finalData];

[NSURLConnection sendAsynchronousRequest:theRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
    if (error) {
        //do something with error
    } else {
        NSString *responseText = [[NSString alloc] initWithData:data encoding: NSASCIIStringEncoding];
        NSLog(@"Response: %@", responseText);

        NSString *newLineStr = @"n";
        responseText = [responseText stringByReplacingOccurrencesOfString:@"<br />" withString:newLineStr];

    }
  }];

"inventoryType" : 0,
 "customerAddress" : "City",
 "customerName" : "abc",
 "DOJ" : "2014-09-30",
 "boardingPoint" : {
 "id" : "4",
 "location" : "Nothing",
 "time" : "06:55PM"
},
"PaxDetails" : [
{
  "nameOnId" : "abc",
  "mobile" : "2760",
  "lastName" : "D",
  "primary" : true,

  }
 ],
 "customerEmail" : "abc@gmail.com",
 "destinationCity" : "XYZ",
 "customerPhone" : "2760",
 "emergencyPhNumber" : "1234",
 "customerLastName" : "D",

 }

Response: <html><head><title>JBoss Web/7.0.13.
 Final - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;}
H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;}
H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;}
BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;}
P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style>
</head><body><h1>HTTP Status 404 - </h1><HR size="1" noshade="noshade"><p><b>type</b>
Status report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The requested resource () is not available.</u></p><HR size="1" noshade="noshade"><h3>JBoss Web/7.0.13.Final</h3></body></html>