Method eleventyProjectMiddleware

server.js:560–624

(req, res)

  // This runs at the end of the middleware chain
  eleventyProjectMiddleware(req, res) {
    // Known issue with `finalhandler` and HTTP/2:
    // UnsupportedWarning: Status message is not supported by HTTP/2 (RFC7540 8.1.2.4)
    // https://github.com/pillarjs/finalhandler/pull/34

    let lastNext = finalhandler(req, res, {
      onerror: (e) => {
        if (e.statusCode === 404) {
          let localPath = TemplatePath.stripLeadingSubPath(
            e.path,
            TemplatePath.absolutePath(this.dir)
          );
          this.logger.error(
            `HTTP ${e.statusCode}: Template not found in output directory (${this.dir}): ${localPath}`
          );
        } else {
          this.logger.error(`HTTP ${e.statusCode}: ${e.message}`);
        }
      },
    });

    // middleware (maybe a serverless request) already set a body upstream, skip this part
    if(!res._shouldForceEnd) {
      let match = this.mapUrlToFilePath(req.url);
      debug( req.url, match );

      if (match) {
        if (match.statusCode === 200 && match.filepath) {
          // Content-Range request, probably Safari trying to stream video
          if (req.headers.range)  {
            return send(req, match.filepath).pipe(res);
          }

          return this.renderFile(match.filepath, res);
        }

        // Redirects, usually for trailing slash to .html stuff
        if (match.url) {
          res.statusCode = match.statusCode;
          res.setHeader("Location", match.url);
          return res.end();
        }

        let raw404Path = this.getOutputDirFilePath("404.html");
        if(match.statusCode === 404 && this.isOutputFilePathExists(raw404Path)) {
          res.statusCode = match.statusCode;
          res.isCustomErrorPage = true;
          return this.renderFile(raw404Path, res);
        }
      }
    }

    if(res.body && !res.bodyUsed) {
      if(res._shouldForceEnd) {
        res.end();
      } else {
        let err = new Error("A response was never written to the stream. Are you missing a server middleware with `res.end()`?");
        err.statusCode = 500;