Any way to get the response body during HTTP errors?

Question

I'm hitting an API that will occasionally throw a HTTP 403 error, and the response body can give some extra information in the form of json, however for the life of me I can't seem to get the information back out from the Alamofire response objects. I see the information in developer tools if I hit the API via chrome. Here's my code:

Alamofire.request(mutableURLRequest).validate().responseJSON() {
    (response) in
    switch response.result {
        case .Success(let data):
            if let jsonResult = data as? NSDictionary {
                completion(jsonResult, error: nil)
            } else if let jsonArray = data as? NSArray {
                let jsonResult = ["array" : jsonArray]
                completion(jsonResult, error: nil)
            }
        case .Failure(let error):
            //error tells me 403
            //response.result.data can't be cast to NSDictionary or NSArray like
            //the successful cases, how do I get the response body?
    }

I've queried pretty much every object attached to the response, but it doesn't seem to give me the response body back in the case of HTTP errors. Is there a work-around or something I'm missing here?

Kevin DiTraglia · Accepted Answer · 2017-02-11T00:52:12.893

112

I asked this question on their github page and got an answer from cnoon:

swift 2:

if let data = response.data {
    let json = String(data: data, encoding: NSUTF8StringEncoding)
    print("Failure Response: \(json)")
}

swift 3:

if let data = response.data {
    let json = String(data: data, encoding: String.Encoding.utf8)
    print("Failure Response: \(json)")
}

https://github.com/Alamofire/Alamofire/issues/1059

I just left out the encoding part, by doing this you are able to get the response json even in the case of errors.

edited Feb 11 '17 at 00:52

answered Feb 10 '16 at 19:59

Kevin DiTraglia

25,746
19
92
138

2

And now (XC8.1, Swift 3) that encoding is : `String(data: data, encoding: String.Encoding.utf8)` – Dilapidus Dec 02 '16 at 18:04
5

If you are using `SwiftyJSON`, you can also do: `JSON(response.data!)` – Isaac Bosca Mar 07 '18 at 14:42
1

Swift 5: The same format works, but you can also use a shorter encoding form with String(data: data, encoding: .utf8) – Rocket Garden Apr 18 '19 at 05:38

score 8 · Answer 2 · answered Apr 09 '20 at 16:54

8

Swift 5 to get body response easily in DefaultDataResponse extension :

String(data: data!, encoding: String.Encoding.utf8)

answered Apr 09 '20 at 16:54

Medhi

2,656
23
16

How do I get data of a specific value in complete response? – IAmNoob Apr 17 '21 at 09:33
This print the all body response, you have to look into the raw data. – Medhi Apr 27 '21 at 15:42

Any way to get the response body during HTTP errors?

2 Answers2

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