Servicestack UnAuthorized - asp.net-core

Question

I am getting "The remote server returned an error: (401) Unauthorized." when using the servicestack utils to call a remote API. It requires auth basic or JWT. Calling the same API from PostMan works fine.
var json = $"http://localhost:5000/API/Proxy/IsValidGuidForSetupDevice?Guid=82870f2ca21148739bff0854b306415c".GetJsonFromUrl(requestFilter: webReq => { webReq.AddBasicAuth("DevAdmin", "test1"); });
if i call below with the same user pass in a browser window. i get a valid connect and a bearer token back. The user\pass is good.
http://localhost:5000/auth/credentials?username=DevAdmin&password=test1&format=json
AM I missing something in request filter of the Util? Maybe I should be calling it differently and using a bearer token?
Update after tracing with fiddler
I moved the code into a unit test in the same project as the servicestack service. Just to remove any variables.
Fiddler shows me that : No Proxy-Authenticate Header is present. WWW-Authenticate Header is present: Basic realm="/auth/apikey" GET http://localhost:5000/auth
Raw View
HTTP/1.1
Host: localhost:5000
Connection: keep-alive
Accept: application/json, text/javascript, */*; q=0.01
DNT: 1
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Referer: http://localhost:5000/
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Cookie: ss-opt=perm; loginLevel=none; X-UAId=2; ss-id=XPc7ivcCrXuN5tEWwARG; ss-pid=TDeEjUiKck82foJGLGtX
Playing around with it. I can get it to login by calling the URL directly with user and pass. The i get the bearer token back and I am able to pass it.
var json = $"http://localhost:5000//auth/credentials?username=DevAdmin&password=test1".GetJsonFromUrl();
var o = JsonObject.Parse(json);
var token = o.Get<string>("bearerToken");
var jsonr = $"http://localhost:5000/API/Proxy/IsValidGuidForSetupDevice?Guid=bc464658d6a640febbd53ba17c351919".GetJsonFromUrl(
requestFilter: webReq => { webReq.AddBearerToken(token); });
I still can't call this in one call with auth headers and I still don't know why.

Answer 1

Whenever diagnosing different behavior between HTTP Requests of different clients you should inspect the raw HTTP Traffic between the different clients using a HTTP Packet sniffer like Fiddler or WireShark, or if the request is made from a browser you can use their built-in Web Network Inspector tools.
Seeing and comparing raw HTTP Request/Responses are the best way to identify how the requests differ.
The AddBasicAuth() extension method lets you add HTTP Basic Auth to the Web Request, if you want to send the JWT Token instead you would use the AddBearerToken() method instead.