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ResponseDetective is a non-intrusive framework for intercepting any outgoing requests and incoming responses between your app and your server for debugging purposes.


ResponseDetective is written in Swift 5.3 and supports iOS 9.0+, macOS 10.10+ and tvOS 9.0+.


Incorporating ResponseDetective in your project is very simple – it all comes down to just two steps:

Step 1: Enable interception

For ResponseDetective to work, it needs to be added as a middleman between your (NS)URLSession and the Internet. You can do this by registering the provided URLProtocol class in your session's (NS)URLSessionConfiguration.protocolClasses, or use a shortcut method:

// Objective-C

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
[RDTResponseDetective enableInConfiguration:configuration];
// Swift

let configuration = URLSessionConfiguration.default
ResponseDetective.enable(inConfiguration: configuration)

Then, you should use that configuration with your (NS)URLSession:

// Objective-C

NSURLSession *session = [[NSURLSession alloc] initWithConfiguration:configuration];
// Swift

let session = URLSession(configuration: configuration)

Or, if you're using AFNetworking/Alamofire as your networking framework, integrating ResponseDetective comes down to just initializing your AFURLSessionManager/Manager with the above (NS)URLSessionConfiguration:

// Objective-C (AFNetworking)

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
// Swift (Alamofire)

let manager = Alamofire.SessionManager(configuration: configuration)

And that's all!

Step 2: Profit

Now it's time to perform the actual request:

// Objective-C

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@""]];
[[session dataTaskWithRequest:request] resume];
// Swift

let request = URLRequest(URL: URL(string: "")!)
session.dataTask(with: request).resume()

Voilà! 🎉 Check out your console output:

<0x000000000badf00d> [REQUEST] GET
 ├─ Headers
 ├─ Body
 │ <none>

<0x000000000badf00d> [RESPONSE] 200 (NO ERROR)
 ├─ Headers
 │ Server: nginx
 │ Date: Thu, 01 Jan 1970 00:00:00 GMT
 │ Content-Type: application/json
 ├─ Body
 │ {
 │   "args" : {
 │   },
 │   "headers" : {
 │     "User-Agent" : "ResponseDetective\/1 CFNetwork\/758.3.15 Darwin\/15.4.0",
 │     "Accept-Encoding" : "gzip, deflate",
 │     "Host" : "",
 │     "Accept-Language" : "en-us",
 │     "Accept" : "*\/*"
 │   },
 │   "url" : "https:\/\/\/get"
 │ }



If you're using Carthage, add the following dependency to your Cartfile:

github "netguru/ResponseDetective" ~> {version}


If you're using CocoaPods, add the following dependency to your Podfile:

pod 'ResponseDetective', '~> {version}'


To install the test dependencies or to build ResponseDetective itself, do not run carthage directly. It can't handle the Apple Silicon architectures introduced in Xcode 12. Instead, run it through the script:

$ ./ bootstrap


This project was made with ♡ by Netguru.

Release names

Starting from version 1.0.0, ResponseDetective's releases are named after Sherlock Holmes canon stories, in chronological order. What happens if we reach 60 releases and there are no more stories? We don't know, maybe we'll start naming them after cats or something.


This project is licensed under MIT License. See for more info.