For Multi Proxy, requests other than GET go to the first Proxy path

[runia2000]

Version

3.0.0-beta.6

Reproduction link

114e085#diff-4e2c5ed8c804940845a451b7ffe71fcc

Steps to reproduce

1. Create two or more Proxies in the devServer> proxy of vue.config.js
2. Post request via Axios to second proxy
3. Ensure that the request is issued to the first proxy

What is expected?

We expect the request to be issued to the appropriate proxy.

What is actually happening?

For Multi Proxy, requests other than GET go to the first Proxy path

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This seems to have occurred as a modification of the issue #945

In the PR 114e085#diff-4e2c5ed8c804940845a451b7ffe71fcc, the request other than GET is treated as true.

Therefore, in case of multi proxy, requests other than GET are directed to the first proxy.