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

从 urllib.request 开始，跟踪对于 HEAD、GET 和 PUT 以外的方法，HTTP 302 响应是如何处理的。将这一路径与文档说明的重定向行为以及提供的 DELETE 示例进行比较；当预期的 DELETE 重定向行为由回归测试覆盖，且不破坏现有的重定向处理时，即视为完成。