INNER CODE UNIT · JavaScript

cors

expressjs/cors · lib/index.js:159

  function cors(options, req, res, next) {
    var headers = [],
      method = req.method && req.method.toUpperCase && req.method.toUpperCase();

    if (method === 'OPTIONS') {
      // preflight
      headers.push(configureOrigin(options, req));
      headers.push(configureCredentials(options))
      headers.push(configureMethods(options))
      headers.push(configureAllowedHeaders(options, req));
      headers.push(configureMaxAge(options))
      headers.push(configureExposedHeaders(options))
      applyHeaders(headers, res);

      if (options.preflightContinue) {
        next();
      } else {
        // Safari (and potentially other browsers) need content-length 0,

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