Chaptet 8 - Single-Origin, Multi-Route Proxy, Invalid URL

reuben158

I followed the code in the course and updated my app.js too look like this

'use strict'
const proxy = require('fastify-http-proxy')
module.exports = async function (fastify, opts) {
  fastify.register(proxy, {
    upstream: 'htt‌ps://news.ycombinator.com/'
  })
}

after running the app, I got this error.

TypeError [ERR_INVALID_URL]: Invalid URL: htt‌ps://news.ycombinator.com/
[fastify-cli] app crashed - waiting for file changes before starting..

any solutions for this one?

davidmarkclements

@reuben158 you've somehow included an invisible zero width non-joiner character, just before the "p" in https, which makes the url invalid.

https://www.fileformat.info/info/unicode/char/200c/index.htm
https://en.wikipedia.org/wiki/Zero-width_non-joiner

reuben158

Hi @davidmarkclements, I am now getting this error

`
18:30:10 ✨ Server listening at http://127.0.0.1:3000
18:30:12 ✨ incoming request GET xxx /
18:30:12 ✨ fetching from remote server
AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

assert(this.servername)

[fastify-cli] app crashed - waiting for file changes before starting...
`

davidmarkclements

@reuben158 did you get this error in WSL as well?

dominik.urban

"use strict";
const path = require("path");
const AutoLoad = require("fastify-autoload");
module.exports = async function (fastify, opts) {
  // Place here your custom code!
  fastify.register(require("fastify-http-proxy"), {
    upstream: "https://news.ycombinator.com/",
  });
  // Do not touch the following lines
  // This loads all plugins defined in plugins
  // those should be support plugins that are reused
  // through your application
  fastify.register(AutoLoad, {
    dir: path.join(__dirname, "plugins"),
    options: Object.assign({}, opts),
  });
  // This loads all plugins defined in routes
  // define your routes in one of these
  fastify.register(AutoLoad, {
    dir: path.join(__dirname, "routes"),
    options: Object.assign({}, opts),
  });
};

With fastify 3.x.x this code above is generated. Paste the custom code and delete the root.js (or uncomment or change the endpoint, whatever...)

davidmarkclements

@reuben158 lmk if you still need help with this otherwise we'll close this thread soon

jhonny111s

@davidmarkclements said:
@reuben158 you've somehow included an invisible zero width non-joiner character, just before the "p" in https, which makes the url invalid.

https://www.fileformat.info/info/unicode/char/200c/index.htm
https://en.wikipedia.org/wiki/Zero-width_non-joiner

I got the same issue and is when we copied the code from that page (Single-Origin, Multi-Route Proxy (1)), VsCode told me "The character U+200c is invisible."

jhonny111s

With the same code right now we got an error FastifyWarning.fastify-http-proxy: fastify-http-proxy has been deprecated., because of the new fastify version.

to solve that please instead use npm i @fastify/http-proxy and in root:

'use strict'
const proxy = require('@fastify/http-proxy')
module.exports = async function (fastify, opts) {
  fastify.register(proxy, {
    upstream: 'https://news.ycombinator.com/'
  })
}

xdxmxc

@fcioanca can we please address the hidden characters problem on the learning platform asap

@jhonny111s thanks for that, this will be resolved in a major content update

dtowerss

Hi guys,
the hidden character is still there when copying the content directly from the course material: