Method _fetch

src/core/fetch/index.js:84–149

(cb = noop)

    }

    _fetch(cb = noop) {
      const { query } = this.route;
      let { path } = this.route;

      // Prevent loading remote content via URL hash
      // Ex: https://foo.com/#//bar.com/file.md
      if (isExternal(path)) {
        history.replaceState(null, '', '#');
        this.router.normalize();
      } else {
        const qs = stringifyQuery(query, ['id']);
        const { loadNavbar, requestHeaders, loadSidebar } = this.config;
        // Abort last request

        const file = this.router.getFile(path);

        this.isRemoteUrl = isExternal(file);
        // Current page is html
        this.isHTML = /\.html$/g.test(file);

        // create a handler that should be called if content was fetched successfully
        const contentFetched = (text, opt) => {
          this._renderMain(
            text,
            opt,
            this._loadSideAndNav(path, qs, loadSidebar, cb)
          );
        };

        // and a handler that is called if content failed to fetch
        const contentFailedToFetch = _ => {
          this._fetchFallbackPage(path, qs, cb) || this._fetch404(file, qs, cb);
        };

        // attempt to fetch content from a virtual route, and fallback to fetching the actual file
        if (!this.isRemoteUrl) {
          this.matchVirtualRoute(path).then(contents => {
            if (typeof contents === 'string') {
              contentFetched(contents);
            } else {
              request(file + qs, true, requestHeaders).then(
                contentFetched,
                contentFailedToFetch
              );
            }
          });
        } else {
          // if the requested url is not local, just fetch the file
          request(file + qs, true, requestHeaders).then(
            contentFetched,
            contentFailedToFetch
          );
        }

        // Load nav
        loadNavbar &&
          loadNested(
            path,