If config useBasicAuthenticationWithAccessCodeGrant is truthy, send client id

and secret as HTTP basic auth during authorization_code grant

README.md

@@ -97,7 +97,8 @@ To use swagger-ui's bundles, you should take a look at the [source of swagger-ui
 
 #### OAuth2 configuration
 You can configure OAuth2 authorization by calling `initOAuth` method with passed configs under the instance of `SwaggerUIBundle`
-default `client_id` and `client_secret`, `realm`, an application name `appName`, `scopeSeparator`, `additionalQueryStringParams`.
+default `client_id` and `client_secret`, `realm`, an application name `appName`, `scopeSeparator`, `additionalQueryStringParams`, 
+`useBasicAuthenticationWithAccessCodeGrant`.
 
 Config Name | Description
 --- | ---
@@ -107,6 +108,7 @@ realm | realm query parameter (for oauth1) added to `authorizationUrl` and `toke
 appName | application name, displayed in authorization popup. MUST be a string
 scopeSeparator | scope separator for passing scopes, encoded before calling, default value is a space (encoded value `%20`). MUST be a string
 additionalQueryStringParams | Additional query parameters added to `authorizationUrl` and `tokenUrl`. MUST be an object
+useBasicAuthenticationWithAccessCodeGrant | Only activated for the `accessCode` flow.  During the `authorization_code` request to the `tokenUrl`, pass the [Client Password](https://tools.ietf.org/html/rfc6749#section-2.3.1) using the HTTP Basic Authentication scheme (`Authorization` header with `Basic base64encoded[client_id:client_secret]`).  The default is `false` 
 
 ```
 const ui = SwaggerUIBundle({...})
@@ -118,7 +120,8 @@ ui.initOAuth({
     realm: "your-realms",
     appName: "your-app-name",
     scopeSeparator: " ",
-    additionalQueryStringParams: {test: "hello"}
+    additionalQueryStringParams: {test: "hello"},
+    useBasicAuthenticationWithAccessCodeGrant: true
   })
 ```