My html page is not rendering on my client, although it's saying it received the html file from my Node.js server

My chrome browser is telling me that it has the test.html file but it is still just a blank page.

This is the html code that I am trying to send

and here is my javascript code that creates the server and the method that send the file to the client

    sendFile(fileName){
        const publicRoot = __dirname.slice(0,-4) + '/public';
        const filePath = publicRoot + fileName;
        //console.log(filePath);
        let fileType = '';
        for(let i=0; i<fileName.length; i++){
          if(fileName[i] === "."){
            fileType += fileName.slice(i+1).trim();
          }
        }
        let encoding;
        if(this.types[fileType].split('/')[0] === "text"){
          encoding = 'utf8';
        }else if(this.types[fileType].split('/')[0] === 'image'){
          encoding = null;
        }
          //console.log(filePath);
          fs.readFile(filePath, encoding, (err,data) => {
            if(err){
              //console.log(err);
              this.setHeader('Content-Type', 'text/plain');
              this.send(500, 'Internal Server Error');
              throw err;
            }else{
              //console.log(this.types[fileType]);
              this.setHeader('Content-Type', this.types[fileType]);
              console.log(encoding);
              console.log(this.headers);
              this.writeHead(200);
              console.log(data);
              console.log(this);
              this.write(data);
              this.end();
            }
          });
      }
    }

    const server = net.createServer((sock)=>{
      sock.on('data', (binaryData) => {
        //console.log(binaryData+'');
        //creates a request Object with the constructor
        const req = new Request(binaryData+'');
        const res = new Response(sock);
        //console.log(req.path);
        if(req.path === "/"){
          res.setHeader('Content-Type','text/html');
          res.send(200,'<link rel = "stylesheet" type = "text/css" href = "foo.css"> <h2>this is a red header</h2><em>Hello</em> <strong>World</strong>');
        }else if(req.path === "/foo.css"){
          res.setHeader('Content-Type', 'text/css');
          res.send(200, 'h2 {color: red;}');
        }else if(req.path === "/test"){
          res.sendFile("/html/test.html");
        }else if(req.path === "/bmo1.gif"){
          res.sendFile("/img/bmo1.gif");
        }else{
          res.setHeader('Content-Type', 'text/plain');
          res.send(404, 'uh oh... 404 page not found!');
        }

      });
    });
    server.listen(PORT, HOST);

I've tried everything and looked up many other cases where somehow the html page does not load. No idea what could be wrong.