不能修改url，只能修改请求头。

Plese fill the template when you reporting a new issue, thanks!

#### Which platform are you running AnyProxy
Windows

#### The version of the AnyProxy
4.0.6

#### Your expected behavior of AnyProxy
我在试图用anyproxy修改url地址。
用官方文档里的
···javascripty
beforeSendRequest(requestDetail) {
if (requestDetail.url.indexOf('https://httpbin.org/user-agent') === 0) {
const newRequestOptions = requestDetail.requestOptions;
requestDetail.protocol = 'http';
newRequestOptions.hostname = '127.0.0.1'
newRequestOptions.port = '8008';
newRequestOptions.path = '/index.html';
newRequestOptions.method = 'GET';
return requestDetail;
}
},
···
这一段代码修改不了。
然后自己是了类似这样的代码、
‘’‘javascript
*beforeSendRequest(requestDetail) {

var url = requestDetail.url;
if (requestDetail.url.indexOf('cats') >=0 ) {
console.log('visited cats, going to dogs....')
var newUrl = 'http://localhost/dogs';

var newOptions = Object.assign({}, requestDetail.requestOptions);
newOptions.path = '/dogs'
console.log(newOptions);
return {
url: newUrl,
requestOptions: newOptions
};
}
},
'''
还是修改不了。有时候成功，请求cat跳转到dog，有时候还是跳转到cat。
我真在做爬虫，有些url参数很复杂，需要去掉一笑参数。然后看结果。

#### The actual behavior of AnyProxy
Anyproxy 不能修改url地址。

#### The log of the error

Start by tracing the documented beforeSendRequest(requestDetail) hook and comparing changes to requestDetail.url with changes to requestDetail.requestOptions. Reproduce the cats-to-dogs example on AnyProxy 4.0.6 under Windows, then verify that URL rewrites are applied consistently and that query-parameter removal works for complex URLs.

Written by the indexing model from the issue text.