How to get original requests in Alamofire 5? - swift

Question

I made a wrapper for Alamofire which makes the data request first and then it prints the details of original URLRequest.
let dataRequest = session.request(url, method: .get, parameters: parameters)
let originalRequest = dataRequest.request
// Now print somehow the details of original request.
It worked fine on Alamofire 4.9, but it stopped in the newest 5.0 version. The problem is that dataRequest.request is nil. Why this behavior has changed? How can I access URLRequest underneath DataRequest?

Answer 1

URLRequests are now created asynchronously in Alamofire 5, so you're not going to be able to access the value immediately. Depending on what you're doing with the URLRequest there may be other solutions. For logging we recommend using the new EventMonitor protocol. You can read our documentation to see more, but adding a simple logger is straightforward:
final class Logger: EventMonitor {
let queue = DispatchQueue(label: ...)
// Event called when any type of Request is resumed.
func requestDidResume(_ request: Request) {
print("Resuming: \(request)")
}
// Event called whenever a DataRequest has parsed a response.
func request<Value>(_ request: DataRequest, didParseResponse response: DataResponse<Value, AFError>) {
debugPrint("Finished: \(response)")
}
}
let logger = Logger()
let session = Session(eventMonitors: [logger])

Answer 2

I had to obtain the URLRequest in a test case. Solved it by adding .responseData and using XCTestExpectation to wait for the async code to return:
func testThatHeadersContainContentEncoding() {
let exp = expectation(description: "\(#function)\(#line)")
let request = AF.request("http://test.org",
method: .post, parameters: ["test":"parameter"],
encoding: GZIPEncoding.default,
headers: ["Other":"Header"])
request.responseData { data in
let myHeader = request.request?.value(forHTTPHeaderField: additionalHeader.dictionary.keys.first!)
// .. do my tests
exp.fulfill()
}
waitForExpectations(timeout: 10, handler: nil)
}