Can not fetch data using Alamofire?

问题:

I am trying to fetch data in my iOS app from my Django backend. In postman if I perform a GET request on the following URL http://127.0.0.1:8000/api/places/categories with the params being Key:"Authorization" Value: "Bearer access_token".I get a JSON response.

Inside my app I am doing something like this with the help of Alamofire:

let access_token  = "123"
let headers = ["Authorization": "Bearer" + access_token]

Alamofire.request(self.categoriesUrl, method: .get, parameters:nil,encoding: JSONEncoding.default,headers: headers).response { response in
            print("Request: \(response.request)")
            print("Response: \(response.response)")
            print("Error: \(response.error)")

            if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
                print("Data: \(utf8Text)")
            }
        }

I get an error saying Authorization Credentials were not provided. I understand this and it asks me to pass in the parameters but the parameters just need a token. So I do something like this:

let access_token  = "123"
let params = ["Authorization": "Bearer" + access_token]

Alamofire.request(self.categoriesUrl, method: .get, parameters:params,encoding: JSONEncoding.default,headers: nil).response { response in
            print("Request: \(response.request)")
            print("Response: \(response.response)")
            print("Error: \(response.error)")

            if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
                print("Data: \(utf8Text)")
            }
        }

It waits for a while but fails to fetch the data with the following error:

Response: nil
Error: Optional(Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo={NSUnderlyingError=0x61800004b0d0 {Error Domain=kCFErrorDomainCFNetwork Code=-1001 "(null)" UserInfo={_kCFStreamErrorCodeKey=-2102, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=http://127.0.0.1:8000/api/places/categories/, NSErrorFailingURLKey=http://127.0.0.1:8000/api/places/categories/, _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2102, NSLocalizedDescription=The request timed out.})
Data: 

EDIT1:

回答1:

This is very simple to fix, I guess you are using iOS10 or later version of OS. So instead of calling http , just call https, which means the API calling protocol has been changed to http to https in iOS10 and later.

回答2:

You have a typo here :

let params = ["Authorization": "Bearer" + access_token]

You're missing a space after Bearer.