code: private String signAndCreateAuthzHeader(String endpointUrl, Map<String, String> parameters) {
  
          String signature = computeSignature(requestMethod, endpointUrl, parameters);
          parameters.put(TwitterConstants.PARAM_OAUTH_SIGNATURE, signature);
  
          String authzHeaderString = createAuthorizationHeaderString(parameters);
          return authzHeaderString;
      }
docs: Generates the Authorization header with all the requisite content for the specified endpoint request by computing the
  signature, adding it to the parameters, and generating the Authorization header string.
  
  @param endpointUrl
  @param parameters
  @return