DELETE redirect not supported [urllib.request]

Bug description:

Compare node.js:

> response = await fetch('http://www.xlog.ch/echo/delete?foo1=bar1&foo2=bar2',
...  {method:'DELETE'}); response.url
'https://www.xlog.ch/echo/delete?foo1=bar1&foo2=bar2'

With CPython:

request = urllib.request.Request('http://www.xlog.ch/echo/delete?foo1=bar1&foo2=bar2', method='DELETE')
response = urllib.request.urlopen(request)
urllib.error.HTTPError: HTTP Error 302:

I believe node.js fetch() redirects, whereas CPython thinks
302 is an error, since the method is neither HEAD, GET or PUT.

But its probably not an error, all methods are allowed:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Redirections

從 urllib.request 開始，追蹤對於 HEAD、GET 和 PUT 以外的方法，HTTP 302 回應是如何處理的。將這條路徑與文件記載的重新導向行為以及提供的 DELETE 範例進行比較；當預期的 DELETE 重新導向行為由回歸測試涵蓋，且不破壞現有的重新導向處理時，即視為完成。