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Add troubleshooting entry for local api endpoint issue on WSL2 #310

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Apr 25, 2024
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Add troubleshooting entry for local api endpoint issue on WSL2 #310

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18 changes: 18 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -300,6 +300,7 @@ which may cause tests to fail unexpectedly

See the [debugging doc](/docs/debugging.md) for details.


## Troubleshooting

### "Docker daemon not running"
Expand Down Expand Up @@ -333,6 +334,23 @@ Run the following command to remove all unused networks:
docker network prune
```

### "POST http://host.docker.internal:(port)/update_jobs/cli/update_dependency_list: No response from server"

When locally running the CLI, if you do not set the `--api-url` argument, the default is
to connect to `host.docker.internal` which is effectively a "loopback" endpoint that just
logs the commands set to it. The default IP address used for sending these requests is
`0.0.0.0` which normally works in Linux.

However, when running under WSL2, for some (currently unknown) reason, the `0.0.0.0` default
setting does not work. The workaround is to add this to your CLI environment:

`export FAKE_API_HOST=127.0.0.1`

This allows the requests to go through on WSL2.

Security-wise, it would actually be better if *this* was the default. For more background on
the issue, see <https://github.com/dependabot/cli/issues/113#issuecomment-1610129508>

[Docker]: https://docs.docker.com/get-started/
[contributing]: ./.github/CONTRIBUTING.md
[updater]: https://github.com/dependabot/dependabot-core/pkgs/container/dependabot-updater
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