feat(proxy): add server.proxy.router like vue-cli/http-proxy-middleware

[cisen]

Description

• This feature implement re-targeting option.target for specific requests. That is very useful when you have multiple backends E.g mockserver, other department' server.
• Vue-cli also has router api, because it use http-proxy-middleware to proxy dev request.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[wxxcarl]

I really need this feature. When will it be finished? Or what can I do about it?

[cisen]

I really need this feature. When will it be finished? Or what can I do about it?

I also need it. But I don't kow why this PR hasn't be merge for about fhree montshs.

[Shinigami92]

question: Why is it safe to use non-null assertion here?
Or could we just add the req.url to the if condition and benefit from source flow analysis?

[cisen]

It's the same code with the main branch's code. I just move it to another line.

vite/packages/vite/src/node/server/middlewares/proxy.ts

Line 82 in e47a6f2

const url = req.url!

If req.url are null, the proxy won't run and the process will go into next middleware. Running in dev-server's proxy, I think it's just fine.

[Zubnix]

Can we get this merged? I'd also like this feature 🙏🏻

[walidmourou]

I am impatiently waiting for this new feature. I hope it will be soon 🙏🏻

[mStirner]

Anything new here?
I also need this feature.

Would be awesome if it could be reviewed @patak-dev

[Ganbin]

It would be very nice to have this feature!

[GlenHeart]

is there any other methods to make this work before the PR merged ?

[kairyou]

Any updates on this PR, or any plans to support dynamic target? It's been 3 years.