the error when fetching some json file

[wtj123]

When using TRON to fetch the json file: "https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json", there is an error occurred but the response code is still 200. Nonetheless, if I used the URLSession.shared.dataTask() instead, the json file is transmitted correctly.

Te-Jen Wu
macpw123@ms4.hinet.net

[DenTelezhkin]

Can you give more specifics? What classes and methods of TRON you've used to fetch file?

[wtj123]

Hi, there Here are the source code and the error message. Hope these can give you enough info. import Foundation import TRON import SwiftyJSON struct Service { let tron = TRON(baseURL: "https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com <https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/>") static let sharedInstance = Service() func fetchHomeFeed(completion: @escaping (HomeDatasource) -> ()) { let request: APIRequest<HomeDatasource, JSONError> = tron.request("/kindle.json") request.perform(withSuccess: { (homeDatasource) in completion(homeDatasource) }) { (err) in print("Failed to fetch json...", err) } } class JSONError: JSONDecodable { required init(json: JSON) throws { print("JSON ERROR") } } } Failed to fetch json... Failed to fetch json... APIError<JsonError>(request: Optional(https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json), response: Optional(<NSHTTPURLResponse: 0x608000036dc0> { URL: https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json } { status code: 200, headers { "Accept-Ranges" = bytes; "Content-Length" = 5435; "Content-Type" = "application/octet-stream"; Date = "Fri, 24 Feb 2017 14:28:36 GMT"; Etag = "\"f20ccea4a6d3d5ab5d82bb65bb1410b8\""; "Last-Modified" = "Tue, 10 Jan 2017 04:55:47 GMT"; Server = AmazonS3; "x-amz-id-2" = "RM7lSU+tXYiKJ72dsYEJceVqtaJkgLWWEYjgzMnN4VmrLSGhkOP5vjsd/zUZR0ypeQA8sui/Hho="; "x-amz-request-id" = 608CC807B2C85B3E; } }), data: Optional(5435 bytes), error: Optional(Alamofire.AFError.responseValidationFailed(Alamofire.AFError.ResponseValidationFailureReason.unacceptableContentType(["application/json"], "text/plain"))), errorModel: Optional(KindleLBTA.Service.JsonError))

…

Denys Telezhkin ***@***.***> 於 2017年2月24日 下午7:23 寫道： Can you give more specifics? What classes and methods of TRON you've used to fetch file? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#26 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ARgzY0Zapp7UYLh6IA57JNhY9Q2Hmdhsks5rfr2zgaJpZM4MK8sm>.

[DenTelezhkin]

There's couple of things is noticed:

1. JSON you mentioned has Array in its root, not Dictionary. Does HomeDatasource object accept array?
2. Error is coming from Alamofire - Optional(Alamofire.AFError.responseValidationFailed(Alamofire.AFError.ResponseValidationFailureReason.unacceptableContentType(["application/json"], "text/plain")))

Make sure your request has appropriate headers that server expects.

[wtj123]

1. the homeDatasource does accept array and work correctly.
2. I used the URLSession.shared.dataTask() instead to fetch the same URL and can get the json file without any errors. the source code is below:

static let sharedInstance = Service()

func fetchHomeFeed(completion: @escaping (HomeDatasource)->()) {
    
    let url = URL(string: "https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json")
    
    URLSession.shared.dataTask(with: url!) { (data, response, error) in
        if error != nil {
            print("failed to fetch data...")
            return
        }
        guard let data = data else {return}
        
        let json = JSON(data: data)
        do {
            let homeDatasource = try HomeDatasource(json: json)
            
            DispatchQueue.main.async(execute: {
                completion(homeDatasource)
            })
            
        } catch {
            print("ERROR")
        }
    }.resume()

}

[wtj123]

the homeDatasource does accept array and work correctly. I used the URLSession.shared.dataTask() instead to fetch the same URL and can get the json file without any errors. the source code is below: static let sharedInstance = Service() func fetchHomeFeed(completion: @escaping (HomeDatasource)->()) { let url = URL(string: "https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json <https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json>") URLSession.shared.dataTask(with: url!) { (data, response, error) in if error != nil { print("failed to fetch data...") return } guard let data = data else {return} let json = JSON(data: data) do { let homeDatasource = try HomeDatasource(json: json) DispatchQueue.main.async(execute: { completion(homeDatasource) }) } catch { print("ERROR") } }.resume() }

…

吳德仁 ***@***.*** ***@***.***>> 於 2017年2月24日 下午10:41 寫道： Hi, there Here are the source code and the error message. Hope these can give you enough info. import Foundation import TRON import SwiftyJSON struct Service { let tron = TRON(baseURL: "https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com <https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/>") static let sharedInstance = Service() func fetchHomeFeed(completion: @escaping (HomeDatasource) -> ()) { let request: APIRequest<HomeDatasource, JSONError> = tron.request("/kindle.json") request.perform(withSuccess: { (homeDatasource) in completion(homeDatasource) }) { (err) in print("Failed to fetch json...", err) } } class JSONError: JSONDecodable { required init(json: JSON) throws { print("JSON ERROR") } } } Failed to fetch json... Failed to fetch json... APIError<JsonError>(request: Optional(https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json <https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json>), response: Optional(<NSHTTPURLResponse: 0x608000036dc0> { URL: https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json <https://letsbuildthatapp-videos.s3-us-west-2.amazonaws.com/kindle.json> } { status code: 200, headers { "Accept-Ranges" = bytes; "Content-Length" = 5435; "Content-Type" = "application/octet-stream"; Date = "Fri, 24 Feb 2017 14:28:36 GMT"; Etag = "\"f20ccea4a6d3d5ab5d82bb65bb1410b8\""; "Last-Modified" = "Tue, 10 Jan 2017 04:55:47 GMT"; Server = AmazonS3; "x-amz-id-2" = "RM7lSU+tXYiKJ72dsYEJceVqtaJkgLWWEYjgzMnN4VmrLSGhkOP5vjsd/zUZR0ypeQA8sui/Hho="; "x-amz-request-id" = 608CC807B2C85B3E; } }), data: Optional(5435 bytes), error: Optional(Alamofire.AFError.responseValidationFailed(Alamofire.AFError.ResponseValidationFailureReason.unacceptableContentType(["application/json"], "text/plain"))), errorModel: Optional(KindleLBTA.Service.JsonError)) > Denys Telezhkin ***@***.*** ***@***.***>> 於 2017年2月24日 下午7:23 寫道： > > Can you give more specifics? What classes and methods of TRON you've used to fetch file? > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub <#26 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ARgzY0Zapp7UYLh6IA57JNhY9Q2Hmdhsks5rfr2zgaJpZM4MK8sm>. >

[DenTelezhkin]

Maybe the problem is with default headers we are setting on HeaderBuilder class. Can you try following before creating request?

tron.headerBuilder = HeaderBuilder(defaultHeaders: [:])

And only after that:

let request: APIRequest<HomeDatasource, JSONError> = tron.request("/kindle.json")

[wtj123]

After adding the setting, the json file can be transmitted correctly. Thanks a lot for your help!