Add flask in Python workers documentation

[hoodmane]

• The change adheres to the documentation style guide.

First we should merge the following workers-py PRs to make this correct:

• Merge Add wsgi.entrypoint like asgi.entrypoint workers-py#232
• Merge fix: Make Headers subclass Mapping workers-py#233

[cloudflare-docs-bot]

Review

⚠️ 4 warnings found in commit 8c13e3d.

👉 Fix in your agent 👈

Fix the following review findings in PR #33074 (https://github.com/cloudflare/cloudflare-docs/pull/33074).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
- If you need clarification before deciding, ask those questions
- Then share your plan for which issues to tackle and in what order

After triaging, follow this order:
1. Post a comment on this PR for any findings you are skipping, with the finding ID and your reasoning.
2. Then commit the fixes for the legitimate findings.

The comment must come before the commit — the bot reads PR comments when a new
push triggers a review, so skip comments posted after the push will be missed.

---

## Code Review

### Warnings (3)

#### CR-4a1d346ca57e · Incorrect framework reference in prose
- **File:** `src/content/docs/workers/languages/python/packages/flask.mdx` line 105
- **Issue:** The sentence reads 'This ensures every request reaches your FastAPI Worker first' in a page documenting Flask. This appears to be a copy-paste error from the FastAPI docs.
- **Fix:** Change 'FastAPI Worker' to 'Flask Worker'.

#### CR-430c4dede8ec · Missing component import
- **File:** `src/content/docs/workers/languages/python/packages/fastapi.mdx` line 28
- **Issue:** The changed line introduces `<Steps>`, but only `Render` and `WranglerConfig` are imported from `~/components` at line 11.
- **Fix:** Add `Steps` to the import statement, e.g. `import { Render, Steps, WranglerConfig } from "~/components";`.

#### CR-886a53abc4f3 · JS Headers object passed as Starlette headers
- **File:** `src/content/docs/workers/languages/python/packages/fastapi.mdx` line 167
- **Issue:** `headers=resp.headers` passes the JavaScript `Headers` object returned by `env.ASSETS.fetch()` directly to FastAPI/Starlette's `Response`. Starlette expects a Python mapping with `.items()`, which a JS `Headers` proxy may not provide.
- **Fix:** Convert the headers to a Python dict first: `headers = dict(resp.headers); return Response(content=body, status_code=resp.status, headers=headers)`.

---

## Conventions

### Warnings (1)

#### CV-991536dee0f0 · Scope accuracy
- **File:** PR-level finding
- **Issue:** The PR adds two new pages (src/content/docs/workers/framework-guides/apis/flask.mdx, src/content/docs/workers/languages/python/packages/flask.mdx) and substantially modifies the FastAPI page (+30/-10), but the description only lists dependent workers-py PRs to merge and never mentions the new Flask pages or the FastAPI changes.
- **Fix:** Describe the actual documentation changes, e.g. that new Flask framework and package guides are added and the FastAPI page is updated to link to them.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (3)

File	Issue
workers/languages/python/packages/flask.mdx line 105	Incorrect framework reference in prose — The sentence reads 'This ensures every request reaches your FastAPI Worker first' in a page documenting Flask. This appears to be a copy-paste error from the FastAPI docs. Fix: Change 'FastAPI Worker' to 'Flask Worker'.
workers/languages/python/packages/fastapi.mdx line 28	Missing component import — The changed line introduces <Steps>, but only Render and WranglerConfig are imported from ~/components at line 11. Fix: Add Steps to the import statement, e.g. import { Render, Steps, WranglerConfig } from "~/components";.
workers/languages/python/packages/fastapi.mdx line 167	JS Headers object passed as Starlette headers — headers=resp.headers passes the JavaScript Headers object returned by env.ASSETS.fetch() directly to FastAPI/Starlette's Response. Starlette expects a Python mapping with .items(), which a JS Headers proxy may not provide. Fix: Convert the headers to a Python dict first: headers = dict(resp.headers); return Response(content=body, status_code=resp.status, headers=headers).

Conventions

Warnings (1)

File

Issue

PR

Scope accuracy — The PR adds two new pages (src/content/docs/workers/framework-guides/apis/flask.mdx, src/content/docs/workers/languages/python/packages/flask.mdx) and substantially modifies the FastAPI page (+30/-10), but the description only lists dependent workers-py PRs to merge and never mentions the new Flask pages or the FastAPI changes. Fix: Describe the actual documentation changes, e.g. that new Flask framework and package guides are added and the FastAPI page is updated to link to them.

Style Guide Review

_{No style-guide issues found.}

Commands

Only codeowners can run commands. Post a comment with the command to trigger it.

Command	Description
/review	Runs a review now. Incremental if a prior review exists, full if not.
/full-review	Re-reviews the entire PR diff from scratch, ignoring incremental history. Useful after a rebase, when you want a fresh review, or if the bot gets out of sync and reports issues that no longer exist.
/ignore-review-limit	Permanently lifts the 2-review automatic limit for this PR. Future pushes will trigger reviews as normal.
/disable-auto-review	Stops automatic reviews from triggering on future pushes to this PR. Codeowners can still run /review or /full-review manually.
/rebase	Rebases the PR branch against production. On conflict, attempts to resolve automatically using AI. Stops with an explanation if confidence is not high enough.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @korinne, @WalshyDev, @cloudflare/deploy-config, @cloudflare/product-owners, @cloudflare/wrangler, @MattieTK, @cloudflare/dev-plat-leads, @vy-ton, @cloudflare/workers-runtime-1

[cloudflare-workers-and-pages]

🚀 Deploying Preview to Cloudflare 🚀

Preview URL: https://hoodmane-flask-docs.previews.developers.cloudflare.com (commit 8c13e3d)

This URL reflects your latest Preview deployment

Preview Deployments by commit

Status	Deployment URL	Commit	Updated (UTC)	See this deployment's details
Build: Success ✅ Deployment: Success ✅ View logs ↗	https://b6078995.previews.developers.cloudflare.com	8c13e3d	2026-08-28T19:09:23.434Z	Visit the dashboard ↗
Build: Success ✅ Deployment: Success ✅ View logs ↗	https://6e8c1c3a.previews.developers.cloudflare.com	aad1ee9	2026-08-28T00:04:43.913Z	Visit the dashboard ↗

[github-actions]

Preview URL: https://8c13e3db.preview.developers.cloudflare.com
Preview Branch URL: https://hoodmane-flask-docs.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/languages/python/packages/flask/	https://hoodmane-flask-docs.preview.developers.cloudflare.com/workers/languages/python/packages/flask/
https://developers.cloudflare.com/workers/languages/python/packages/fastapi/	https://hoodmane-flask-docs.preview.developers.cloudflare.com/workers/languages/python/packages/fastapi/
https://developers.cloudflare.com/workers/framework-guides/apis/flask/	https://hoodmane-flask-docs.preview.developers.cloudflare.com/workers/framework-guides/apis/flask/

[ryanking13]

I prefer not to expose pyodide FFIs in cloudflare docs if possible, maybe let's replace it with asyncio.run or asyncio.run_until_complete.

[hoodmane]

I still think those are confusing because they are not normally reentrant.