feat (pages): Proxying (200) in _redirects

[Skye-31]

What this PR solves / how to test:
This PR enables Pages _redirects to support proxying to files on a different url, for example pointing /users/123 to /users/id.html, to enable a more dynamic functionality for static sites.

Associated docs issues/PR:

• [Pages] _redirects proxying functionality cloudflare-docs#7613

Author has included the following, where applicable:

• Tests
• Changeset

Reviewer has performed the following, where applicable:

• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

[changeset-bot]

🦋 Changeset detected

Latest commit: e04b0e1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@cloudflare/pages-shared	Minor
wrangler	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/runs/4193296716/npm-package-wrangler-2708

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/prs/2708/npm-package-wrangler-2708

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/runs/4193296716/npm-package-wrangler-2708 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/runs/4193296716/npm-package-cloudflare-pages-shared-2708

[GregBrimble]

Ah, sorry! Wrong button. Meant to approve your workflows and accidentally marked this PR as ready for review. Feel free to put it back, if you can :)

[Skye-31]

No worries 😄
Just keeping it as draft until I get around to the docs on the weekend, I belive it's good to go otherwise!

[Skye-31]

Docs pull made

[GregBrimble]

Amazing stuff. Thank you for your contribution! Only thing I'd like to look at is reusing the existing validateUrl() function. Everything else looks perfect :)

[GregBrimble]

LGTM! Thanks again for the contribution! I'll leave this up for a day just to allow others to comment if others have opinions, and then I'll merge.

It'll be available in wrangler@beta pages dev immediately, and then @cloudflare/pages-shared and wrangler@latest when we next cut a release. We'll pull in these changes in production shortly afterwards and then do a release. Probably ~mid-next-week-ish by the time that it's live on Cloudflare Pages.

[codecov]

Codecov Report

Merging #2708 (54a4e19) into main (0f29093) will increase coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 54a4e19 differs from pull request most recent head e04b0e1. Consider uploading reports for the commit e04b0e1 to get more accurate results

@@            Coverage Diff             @@
##             main    #2708      +/-   ##
==========================================
+ Coverage   74.03%   74.06%   +0.02%     
==========================================
  Files         166      166              
  Lines       10154    10154              
  Branches     2702     2702              
==========================================
+ Hits         7518     7521       +3     
+ Misses       2636     2633       -3     

Impacted Files	Coverage Δ
packages/wrangler/src/git-client.ts	43.75% <0.00%> (+4.16%)	⬆️
...ackages/wrangler/src/__tests__/helpers/mock-bin.ts	100.00% <0.00%> (+5.26%)	⬆️