正向代理访问腾讯云cos时http405的问题

当使用正向代理请求cos资源的时候，cos对http协议的支持会比较严谨，“宽容性”不够。可能对http协议更加谨慎一点反而更好吧

响应405的请求细节

GET http://nfs-test.cosgz.myqcloud.com/user_logo/1000293461_50x50.jpg?sign=testsign HTTP/1.1
Host: nfs-test.cosgz.myqcloud.com
User-Agent: curl
Accept: */*

HTTP/1.1 405 Error
Server: TencentCOS
Content-Type: text/octet
ServerIP: 127.1.1.1
Content-Length: 78

{"errorcode":-46152,"errormsg":"bucket name has illegal char, retcode:-46152"}

正常的请求应该是

GET /user_logo/1000293461_50x50.jpg?sign=testsign HTTP/1.1
User-Agent: curl/7.29.0
Host: nfs-test.cosgz.myqcloud.com
Accept: */*

当使用有的正向代理的时候，头部GET部分会跟正常的请求不一样，而cos的服务只认第二种写法（标准的http协议），当然有一些站点就兼容第一种的写法：look

* Rebuilt URL to: www.baidu.com/
*   Trying proxy-ip...
* Connected to  proxy-ip ( proxy-ip) port 8090 (#0)
* Proxy auth using Basic with user 'mom'
> GET http://www.baidu.com/ HTTP/1.1
> Host: www.baidu.com
> Proxy-Authorization: Basic uuuuuuuuuuuuu
> User-Agent: curl
> Accept: */*
> 
< HTTP/1.1 200 OK
< Accept-Ranges: bytes

如果还是用http，1.1的协议，正向代理必须开启通道模式，这样正向代理的get头部拼装就会停止，访问cos就正常了，比如这样

curl -v --proxy "proxy-ip:8090"   --proxytunnel "http://nfs-test.cosgz.myqcloud.com/user_logo/1000293461_50x50.jpg?sign=your-sign"

或者直接使用Https协议