"summary": "Login",
                    "operationId": "login_login__post",
                    "requestBody": {
                        "content": {
                            "application/x-www-form-urlencoded": {
                                "schema": {"$ref": "#/components/schemas/FormData"}
                            }
                        },
                        "required": True,
                    },

        def fetch_credentials():
            # HTTP headers are case insensitive filter out
            # all duplicate headers and pick one.
            headers = {}
            headers['content-type'] = 'application/x-www-form-urlencoded'
            headers['authorization'] = urllib3.make_headers(
                basic_auth='%s:%s' % (self.cid, self.csec))['authorization']

            response = self._http.urlopen('POST', self.idp_ep,

```
curl -u <CLIENT_ID>:<CLIENT_SECRET> -k -d "grant_type=client_credentials" -H "Content-Type:application/x-www-form-urlencoded" https://<IS_HOST>:<IS_HTTPS_PORT>/oauth2/token
```

Example:

```
curl -u PoEgXP6uVO45IsENRngDXj5Au5Ya:eKsw6z8CtOJVBtrOWvhRWL4TUCga -k -d "grant_type=client_credentials" -H "Content-Type:application/x-www-form-urlencoded" https://localhost:9443/oauth2/token
```

                    "summary": "Login",
                    "operationId": "login_login__post",
                    "requestBody": {
                        "content": {
                            "application/x-www-form-urlencoded": {
                                "schema": {"$ref": "#/components/schemas/FormData"}
                            }
                        },
                        "required": True,
                    },

                    "summary": "Login",
                    "operationId": "login_login__post",
                    "requestBody": {
                        "content": {
                            "application/x-www-form-urlencoded": {
                                "schema": {
                                    "$ref": "#/components/schemas/Body_login_login__post"
                                }
                            }

            charset = charset,
          )
      }

      fun build(): FormBody = FormBody(names, values)
    }

  companion object {
    private val CONTENT_TYPE: MediaType = "application/x-www-form-urlencoded".toMediaType()
  }

                        "operationId": "read_items_items__post",
                        "requestBody": {
                            "content": {
                                "application/x-www-form-urlencoded": {
                                    "schema": {
                                        "$ref": "#/components/schemas/Body_read_items_items__post"
                                    }
                                }

                    "summary": "Login",
                    "operationId": "login_token_post",
                    "requestBody": {
                        "content": {
                            "application/x-www-form-urlencoded": {
                                "schema": {
                                    "$ref": "#/components/schemas/Body_login_token_post"
                                }
                            }

        if ("Content-Type".equals(parts[0], ignoreCase = true)) {
          return@let parts[1].trim()
        }
      }
      return@let null
    } ?: "application/x-www-form-urlencoded"

  return mimeType.toMediaTypeOrNull()
}

private fun isSpecialHeader(s: String): Boolean = s.equals("Content-Type", ignoreCase = true)

fun Main.commonRun() {
  client = createClient()

    assertUnescaped(e, 'z');
    assertUnescaped(e, 'A');
    assertUnescaped(e, 'Z');
    assertUnescaped(e, '0');
    assertUnescaped(e, '9');

    // Unreserved characters used in java.net.URLEncoder
    assertUnescaped(e, '-');
    assertUnescaped(e, '_');
    assertUnescaped(e, '.');
    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del