fix: auth scheme and token from client level #959

Author: jeevatkm

Diff for: middleware.go

@@ -298,9 +298,16 @@ func addCredentials(c *Client, r *Request) error {
 		}
 	}
 
+	authScheme := c.AuthScheme
+	if !IsStringEmpty(r.AuthScheme) {
+		authScheme = r.AuthScheme
+	}
+
 	// Build the token Auth header
 	if !IsStringEmpty(r.Token) {
-		r.RawRequest.Header.Set(c.HeaderAuthorizationKey, strings.TrimSpace(r.AuthScheme+" "+r.Token))
+		r.RawRequest.Header.Set(c.HeaderAuthorizationKey, strings.TrimSpace(authScheme+" "+r.Token))
+	} else if !IsStringEmpty(c.Token) {
+		r.RawRequest.Header.Set(c.HeaderAuthorizationKey, strings.TrimSpace(authScheme+" "+c.Token))
 	}
 
 	return nil