Method createRequestInit

packages/common/http/src/fetch.ts:350–405

(req: HttpRequest<any>)

  }

  private createRequestInit(req: HttpRequest<any>): RequestInit {
    if (req.reportUploadProgress) {
      throw new RuntimeError(
        RuntimeErrorCode.FETCH_UPLOAD_PROGRESS_NOT_SUPPORTED,
        ngDevMode &&
          'The FetchBackend does not support upload progress reporting. Please use `withXhr()` on your `provideHttpClient()` configuration if you want to report upload progress.',
      );
    }

    // We could share some of this logic with the XhrBackend
    const headers: Record<string, string> = {};
    let credentials: RequestCredentials | undefined;

    // If the request has a credentials property, use it.
    // Otherwise, if the request has withCredentials set to true, use 'include'.
    credentials = req.credentials;

    // If withCredentials is true should be set to 'include', for compatibility
    if (req.withCredentials) {
      // A warning is logged in development mode if the request has both
      (typeof ngDevMode === 'undefined' || ngDevMode) && warningOptionsMessage(req);
      credentials = 'include';
    }

    // Setting all the requested headers.
    req.headers.forEach((name, values) => (headers[name] = values.join(',')));

    // Add an Accept header if one isn't present already.
    if (!req.headers.has(ACCEPT_HEADER)) {
      headers[ACCEPT_HEADER] = ACCEPT_HEADER_VALUE;
    }

    // Auto-detect the Content-Type header if one isn't present already.
    if (!req.headers.has(CONTENT_TYPE_HEADER)) {
      const detectedType = req.detectContentTypeHeader();
      // Sometimes Content-Type detection fails.
      if (detectedType !== null) {
        headers[CONTENT_TYPE_HEADER] = detectedType;
      }
    }

    return {
      body: req.serializeBody(),
      method: req.method,
      headers,
      credentials,
      keepalive: req.keepalive,
      cache: req.cache,
      priority: req.priority,
      mode: req.mode,
      redirect: req.redirect,
      referrer: req.referrer,
      integrity: req.integrity,
      referrerPolicy: req.referrerPolicy,
    };
  }

  private concatChunks(chunks: Uint8Array[], totalLength: number): Uint8Array<ArrayBuffer> {