Unable to get response using AFNetworking 2.0 using GET method

Question

I am unable to get data using this approach, however its working when using other url and i have also tested in postman where i am getting response.

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

// if you want to sent parameters you can use above code

manager.requestSerializer = [AFJSONRequestSerializer serializer];

[manager GET:@"http://192.168.1.156:81/a.php" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSLog(@"responseObject %@",responseObject);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

}];

Error:

"Request failed: unacceptable content-type: text/html" UserInfo=0x8a6b000 {NSErrorFailingURLKey=http://192.168.1.156:81/a.php, AFNetworkingOperationFailingURLResponseErrorKey= { URL: http://192.168.1.156:81/a.php } { status code: 200, headers {
    Connection = "Keep-Alive";
    "Content-Type" = "text/html";
    Date = "Tue, 20 May 2014 14:49:20 GMT";
    "Keep-Alive" = "timeout=5, max=100";
    Server = "Apache/2.4.4 (Win64) PHP/5.4.12";
    "Transfer-Encoding" = Identity;
    "X-Powered-By" = "PHP/5.4.12";
} }, NSLocalizedDescription=Request failed: unacceptable content-type: text/html}

NSArray Conversion Error:

Parsing JSON failed: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Invalid escape sequence around character 4677.) UserInfo=0xa82c130 {NSDebugDescription=Invalid escape sequence around character 4677.}
Parse error on line 258:
...     "story_title": "today\'s story",  
-----------------------^
Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '['

Have you examined the NSError object in the failure block? What does it say? — Rob
Unrelated to your question, but, BTW, it's a little curious to specify a AFJSONRequestSerializer for a GET request. GET requests don't have a body, but rather encode their parameters in the URL. And, besides, you don't have any parameters. — Rob

Rob Rob · Accepted Answer · 2014-05-20T14:48:03

Your error message is telling you that AFNetworking was expecting a JSON response (i.e., the Content-Type of the header of the response should be application/json and the body of the response should be the actual JSON).

One of number of possibilities here:

Your service is returning a JSON body, but neglected to specify the Content-Type header. In your PHP code, before sending any data, specify the Content-Type header:
```
header("Content-Type: application/json");
```
If you cannot fix the PHP (which is the preferred solution), you can alternatively tell AFNetworking to accept also text/html as a Content-Type. I haven't tested this, but something like the following should add text/html to the set of acceptableContentTypes of the default AFJSONResponseSerializer:
```
manager.responseSerializer.acceptableContentTypes = [manager.responseSerializer.acceptableContentTypes setByAddingObject:@"text/html"];
```
Your web service is not designed to return JSON. In that case, you should configure the manager to accept non-JSON responses, e.g.:
```
mananger.responseSerializer = [AFHTTPResponseSerializer serializer];
```
Your web service is designed to properly return JSON responses, but it encountered some programmatic error that prevented the JSON from being properly generated. In that case, it can be useful to temporarily change the manager to accept non-JSON responses (like point 2, above), and then examine the response (assuming, of course, you've configured your php.ini to report errors):
```
NSLog(@"responseObject = %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding);
```
If you're seeing your JSON, you could convert that to an array using NSJSONSerialization:
```
NSError *error;
NSArray *array = [NSJSONSerialization JSONObjectWithData:responseObject options:0 error:&error];
if (!array) {
    NSLog(@"Parsing JSON failed: %@", error);
}
```
Obviously, you can then save this local NSArray object into whatever class property or instance variable you want.

You've updated your question with the JSON parsing error. This is a result of the \ character in the JSON. That's not valid. (Paste your JSON in http://jsonlint.com and it will confirm this.) Your PHP is not generating the JSON correctly. Remove that \ before the '. You should use this backslash escape only when including double quotes in your JSON.

Frankly, it looks like you created this JSON manually. It's much better to use PHP function json_encode which does all of the appropriate escaping for you, avoiding these sorts of JSON errors altogether.

Unable to get response using AFNetworking 2.0 using GET method

3 Answers