add stateless http transport support

[Edison-A-N]

Describe your changes

add stateless http transport support

Issue ticket number and link (if applicable)

#209

Screenshots of the feature / bugfix

Checklist before requesting a review

• Added relevant tests
• Run ruff & mypy
• All tests pass

[buhaiqing]

I hope this feature can be officially released as soon as possible

[frouzbeh]

Hi, Is this pr complete? I am trying to use langchain mcp-adapter client, and it seems it only supports stateless streamable_http.

[Edison-A-N]

Hi @frouzbeh

You can test the changes in either branch—both are already rebased on the latest main:

• feature/stateless-flag
• feature-test

Both branches contain the feature proposed in this PR.

[jakegt1]

this really would be great to have merged as atm you simply cannot use this with gunicorn at all.

[Edison-A-N]

You're right — as I mentioned in this comment, the current implementation breaks under Gunicorn with multi workers.

[brendanshanahan]

You're right — as I mentioned in this comment, the current implementation breaks under Gunicorn with multi workers.

it would be great to get this merged. i'm hitting the same wall with a multi-worker gunicorn application and switching it to single-worker is not an option

[jakegt1]

@itay-tadata sorry for the ping here, but this just seems a really useful feature for the project. Do you mind taking a look if you have the time?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Derican]

I noticed that this PR contains a feature that would be very helpful for my work. May I kindly ask if there is an estimated timeline for when it might be merged into the main release?

[jakegt1]

I noticed that this PR contains a feature that would be very helpful for my work. May I kindly ask if there is an estimated timeline for when it might be merged into the main release?

i would recommend just forking it yourself honestly. Currently this system is unworkable if you use gunicorn until stateless is enabled.

[Ashes47]

Can we please merge this pull request, i am facing a similar issue :)

[AbdulEmad]

Guys LGTM!!!!!!

[ltalirz]

hm... just realizing the package has not seen a commit since 7 months; more than the time from first to last commit.

Is there a better way add mcp to a fastapi nowadays?

[Edison-A-N]

@Italirz +1 on the maintenance concern.

I've been using goFastMCP instead