URLSession doesn't pass 'Authorization' key in header swift 4

Question

I am trying to pass authorization key in header of a URLRequest. But at the server end the key is not received. The same API when called from postman working fine. Any other key in the header is working fine, even authorizations key is visible at server end.

Here is my code:

let headers = [
    "authorization": "token abcd"
]

var request = URLRequest.init(url: NSURL(string:
    "http://127.0.0.1:7000/api/channels?filter=contributed")! as URL)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers
let config = URLSessionConfiguration.default
config.httpAdditionalHeaders = headers
let session = URLSession.init(configuration: config)

let dataTask = session.dataTask(with: request, completionHandler: { (data, response, error) -> Void in
    if (error != nil) {
        print(error ?? "")
    } else {
        let httpResponse = response as? HTTPURLResponse
        print(httpResponse ?? "")
    }
})

As you can see, I tried to set the token in both session config and request but none is working.

Answer 1

If you want token to be hardcoded, I guess it has to be like this:

urlRequest.httpMethod = "GET"
urlRequest.setValue("Token <Your Token>", forHTTPHeaderField: "Authorization")

Answer 2

Looks like the problem is that you are modifying Authorization header using httpAdditionalHeaders which is something you should not do.

From the Doc

An NSURLSession object is designed to handle various aspects of the HTTP protocol for you. As a result, you should not modify the following headers: Authorization, Connection, Host, Proxy-Authenticate, Proxy-Authorization, WWW-Authenticate

Removing the line config.httpAdditionalHeaders = headers should fix the issue.