[BUG] startup failure caused by dependencies, requires httpx

[Bidaya0]

Checklist

• I checked the FAQ section of the documentation
• I looked for similar issues in the issue tracker

Describe the bug
Because the upstream starlette updated the dependencies,the following error occurs
ModuleNotFoundError: No module named 'httpx'

To Reproduce

https://github.com/HXSecurity/DongTai/actions/runs/3132544194/jobs/5084991907
File "/home/runner/.local/bin/schemathesis", line 5, in
from schemathesis.cli import schemathesis
File "/home/runner/.local/lib/python3.8/site-packages/schemathesis/init.py", line 7, in
from . import auth, fixups, graphql, hooks, runner, serializers, targets
File "/home/runner/.local/lib/python3.8/site-packages/schemathesis/graphql.py", line 3, in
from .specs.graphql import nodes
File "/home/runner/.local/lib/python3.8/site-packages/schemathesis/specs/graphql/init.py", line 1, in
from .loaders import from_asgi, from_dict, from_file, from_path, from_url, from_wsgi
File "/home/runner/.local/lib/python3.8/site-packages/schemathesis/specs/graphql/loaders.py", line 9, in
from starlette.testclient import TestClient as ASGIClient
File "/home/runner/.local/lib/python3.8/site-packages/starlette/testclient.py", line 15, in
import httpx
ModuleNotFoundError: No module named 'httpx'

Expected behavior
It seems that dependencies that are still in version 0.x.y should not be used openly, which means their api is still changing frequently.

Environment (please complete the following information):

• OS:Linux
• Python version: 3.8
• Schemathesis version: 3.17.2

Additional context
looks related to this
encode/starlette#1376

It looks like this issue is not fully resolved.
#1417

[t-huyeng]

I can confirm this issue.

• using GitHub Actions

[TheMatrix97]

facing the same issue, no matter what version of schemathesis / python

[Kludex]

pip install httpx is a temporary fix 👀

[mdavis-xyz]

The starlette readme says:

Starlette only requires anyio, and the following are optional:

• [httpx](https://www.python-httpx.org/) - Required if you want to use the TestClient.
  

It looks like Schemathesis wants to use the TestClient, therefore httpx should be added as a non-temporary requirement of schemathesis. I'll write a PR for that.

[mdavis-xyz]

Ah actually it looks like schemathesis uses poetry, which I am not familiar with. So I'm not confident I know where to add the new dependency.

Can someone else add it? Does it go in pyproject.toml or poetry.lock?

[Kludex]

poetry add httpx>=0.22.0
poetry lock --no-update

[mdavis-xyz]

Ok I'll try that.

Why did you say httpx>=0.22.0 and not just httpx?

[Kludex]

Because it's the minimum version that Starlette supports. 🙏

[CommanderStorm]

pip install httpx is a temporary fix eyes

This is awkward: How did you do this?
I tried to add this dependency via pip this way, but this does not work, as (assuming this is the culprit) the schemathesis action does install python dependencies itself.

[Kludex]

idk, different virtual env? 🤷‍♂️

[devicehzy]

• solution by poetry

[tool.poetry.dependencies]
starlette = "0.17.1"
werkzeug = "2.0.2"

[Stranger6667]

The issue is fixed in 3.17.3. Let me know if the fix doesn't work for you

[Stranger6667]

And sorry for the delay!