SOCKS protocol error

[brookhong]

I'm using polipo to convert a sock5 proxy to http proxy. The socks5 proxy works fine as below

curl -v --socks5-hostname xx.xx.xx.xx:1080 https://www.google.com

But I got SOCKS protocol error when using http proxy from polipo.

1. start polipo

   polipo socksProxyType=socks5 socksParentProxy=xx.xx.xx.xx:1080 proxyAddress="0.0.0.0"

2. use the http proxy

   curl -v -x 127.0.0.1:8123 https://www.google.com

    * Rebuilt URL to: https://www.google.com/
    *   Trying 127.0.0.1...
    * TCP_NODELAY set
    * Connected to 127.0.0.1 (127.0.0.1) port 8123 (#0)
    * Establish HTTP proxy tunnel to www.google.com:443
    > CONNECT www.google.com:443 HTTP/1.1
    > Host: www.google.com:443
    > User-Agent: curl/7.54.0
    > Proxy-Connection: Keep-Alive
    > 
    < HTTP/1.1 504 Couldn't connect: SOCKS protocol error
    < Connection: close
    < Date: Thu, 18 Oct 2018 15:18:01 GMT
    < Content-Type: text/html
    < Content-Length: 475
    < Expires: 0
    < Cache-Control: no-cache
    < Pragma: no-cache
    < 
    * Received HTTP code 504 from proxy after CONNECT
    * Closing connection 0
    curl: (56) Received HTTP code 504 from proxy after CONNECT
   

[tmaly1980]

Did you ever get this working? Have you tried HTTP rather than HTTPS? I read in another bug report that HTTPS is not supported.

[rampageX]

Working here:

polipo -c /opt/etc/polipo/config

Established listening socket on port 56789.
tunnel www.google.com:443 allowed
tunnel www.twitter.com:443 allowed

curl -v -I -x 127.0.0.1:56789 https://www.google.com

*   Trying 127.0.0.1:56789...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 56789 (#0)
* allocate connect buffer!
* Establish HTTP proxy tunnel to www.google.com:443
> CONNECT www.google.com:443 HTTP/1.1
> Host: www.google.com:443
> User-Agent: curl/7.67.0
> Proxy-Connection: Keep-Alive
>
< HTTP/1.1 200 Tunnel established
HTTP/1.1 200 Tunnel established
<

* Proxy replied 200 to CONNECT request
* CONNECT phase completed!
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /opt/etc/ssl/certs/ca-certificates.crt
  CApath: /mmc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* CONNECT phase completed!
* CONNECT phase completed!
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: C=US; ST=California; L=Mountain View; O=Google LLC; CN=www.google.com
*  start date: Dec 20 13:13:44 2019 GMT
*  expire date: Mar 13 13:13:44 2020 GMT
*  subjectAltName: host "www.google.com" matched cert's "www.google.com"
*  issuer: C=US; O=Google Trust Services; CN=GTS CA 1O1
*  SSL certificate verify ok.
> HEAD / HTTP/1.1
> Host: www.google.com
> User-Agent: curl/7.67.0
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
HTTP/1.1 200 OK

[20NE]

I'm using polipo to convert a sock5 proxy to http proxy. The socks5 proxy works fine as below

curl -v --socks5-hostname xx.xx.xx.xx:1080 https://www.google.com

But I got SOCKS protocol error when using http proxy from polipo.

1. start polipo
   polipo socksProxyType=socks5 socksParentProxy=xx.xx.xx.xx:1080 proxyAddress="0.0.0.0"

2. use the http proxy
   curl -v -x 127.0.0.1:8123 https://www.google.com
   ```
    * Rebuilt URL to: https://www.google.com/
    *   Trying 127.0.0.1...
    * TCP_NODELAY set
    * Connected to 127.0.0.1 (127.0.0.1) port 8123 (#0)
    * Establish HTTP proxy tunnel to www.google.com:443
    > CONNECT www.google.com:443 HTTP/1.1
    > Host: www.google.com:443
    > User-Agent: curl/7.54.0
    > Proxy-Connection: Keep-Alive
    > 
    < HTTP/1.1 504 Couldn't connect: SOCKS protocol error
    < Connection: close
    < Date: Thu, 18 Oct 2018 15:18:01 GMT
    < Content-Type: text/html
    < Content-Length: 475
    < Expires: 0
    < Cache-Control: no-cache
    < Pragma: no-cache
    < 
    * Received HTTP code 504 from proxy after CONNECT
    * Closing connection 0
    curl: (56) Received HTTP code 504 from proxy after CONNECT
   ```

same here, only when polipo use v2ray socks as socksparentproxy

[jech]

Polipo is no longer being maintained. Sorry.