Using local SSL for `netlify dev` results in the edge function not receiving the correct scheme, hostname, or port

[overlordofmu]

Describe the bug

When not using SSL locally with netlify dev, edge functions will see the hostname requested by the HTTP client (curl in these examples).

However, when using SSL locally with netlify dev, edge functions will see the hostname as localhost and the port number used will also be changed to the randomly assigned port that a netlify dev HTTP server is listening on (which is not the port the client makes the request to).

This should not occur. For local development, the edge function should correctly receive the URL requested by the client even when SSL is being used.

Steps to reproduce

Reproduction steps:

1. Provision a local SSL certificate. (I used the Let’s Encrypt certbot utility to do so.)
2. Configure netlify dev to use that certificate for SSL:
   You can define a local SSL configuration with netlify dev using the following syntax in netlify.toml:

[dev.https]
  certFile = "ssl/fullchain.pem"  ## these are the filenames used by Let’s Encrypt
  keyFile = "ssl/privkey.pem"     ## these are the filenames used by Let’s Encrypt

3. Add the hostname in question to the local /etc/host file like so (using foo.example.com here):

127.0.0.1	localhost foo.example.com

4. Make an edge functions that logs the request URL. I used this:

import type {Context, Config } from "https://edge.netlify.com";

export default (request: Request, context: Context) => {
  const requestURL = new URL(request.url);
  console.log("Logging requestURL:");
  console.log(requestURL);
  return context.next();
};

export const config: Config = {
  path: "/*",
  excludedPath: ["/*.css", "/*.js"],
  onError: "bypass"
};

5. Start the CLI dev instance with: netlify dev
6. Make a request to the site locally using: curl https://foo.example.com:8888/ (note: the URL is using HTTPS)

• at this point the logging should show this (and it will if HTTP only is used):

[request-logging] Logging requestURL:
[request-logging] URL {
  href: "https://foo.example.com:8888/",
  origin: "https://foo.example.com:8888",
  protocol: "https:",
  username: "",
  password: "",
  host: "foo.example.com:8888",
  hostname: "foo.example.com",
  port: "8888",
  pathname: "/",
  hash: "",
  search: ""
}

7. Note that, instead, it shows something like this:

[request-logging] Logging requestURL:
[request-logging] URL {
  href: "http://localhost:49419/",
  origin: "http://localhost:49419",
  protocol: "http:",
  username: "",
  password: "",
  host: "localhost:49419",
  hostname: "localhost",
  port: "49419",
  pathname: "/",
  hash: "",
  search: ""
}

The protocol, hostname, and port - all three - have been changed from the point of view of the edge function.

If SSL is not used with netlify dev this does not occur. Without local SSL, the edge functions gets the correct request information from the client.

Note, you will need to use a real domain name you control to provision the SSL. The domain used in testing was not foo.example.com and that is only a placeholder for the actual domain used.

Configuration

The netlify.toml sections that are applicable:

[dev]
  command = "hugo server -w" # Command to start your dev server
  port = 8888   # The port that the netlify dev will use
  targetPort = 1313
  publish = "public" # The path to your static content folder

[dev.https]
  certFile = "ssl/fullchain.pem"
  keyFile = "ssl/privkey.pem"

The edge function code request-logging.ts:

import type {Context, Config } from "https://edge.netlify.com";

export default (request: Request, context: Context) => {
  const requestURL = new URL(request.url);
  console.log("Logging requestURL:");
  console.log(requestURL);
  return context.next();
};

export const config: Config = {
  path: "/*",
  excludedPath: ["/*.css", "/*.js"],
  onError: "bypass"
};

Environment

  System:
    OS: macOS 13.5
    CPU: (10) arm64 Apple M1 Pro
    Memory: 4.30 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.16.0 - ~/.nvm/versions/node/v18.16.0/bin/node
    npm: 9.5.1 - ~/.nvm/versions/node/v18.16.0/bin/npm
  npmGlobalPackages:
    netlify-cli: 16.0.2