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Re: Test the news server connectivity over http proxy with curl.
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From: Hongyi Zhao via curl-users <curl-users_at_cool.haxx.se>
Date: Thu, 18 Mar 2021 17:41:22 +0800
On Thu, Mar 18, 2021 at 5:03 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
>
> On Thu, 18 Mar 2021, Hongyi Zhao via curl-users wrote:
>
> > On Ubuntu 20.04, I have a local HTTP proxy listening on port 8080
>
> ...
>
> > werner_at_X10DAi:~$ curl -vIx http://127.0.0.1:8080 telnet://news.rusnet.ru:119
>
> > < HTTP/1.1 403 Forbidden
>
> See, the proxy says it is forbidden. Proxies typically allow-lists what
> specific port numbers clients are allowed to CONNECT through to.
Why did the test based on the SOCKS5 proxy succeed?:
$ curl -vIx socks5://127.0.0.1:18888 telnet://news.rusnet.ru:119
* Trying 127.0.0.1:18888...
* TCP_NODELAY set
* SOCKS5 communication to news.rusnet.ru:119
* SOCKS5 connect to IPv4 195.208.113.96:119 (locally resolved)
* SOCKS5 request granted.
* Connected to 127.0.0.1 (127.0.0.1) port 18888 (#0)
^C
Regards
Date: Thu, 18 Mar 2021 17:41:22 +0800
On Thu, Mar 18, 2021 at 5:03 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
>
> On Thu, 18 Mar 2021, Hongyi Zhao via curl-users wrote:
>
> > On Ubuntu 20.04, I have a local HTTP proxy listening on port 8080
>
> ...
>
> > werner_at_X10DAi:~$ curl -vIx http://127.0.0.1:8080 telnet://news.rusnet.ru:119
>
> > < HTTP/1.1 403 Forbidden
>
> See, the proxy says it is forbidden. Proxies typically allow-lists what
> specific port numbers clients are allowed to CONNECT through to.
Why did the test based on the SOCKS5 proxy succeed?:
$ curl -vIx socks5://127.0.0.1:18888 telnet://news.rusnet.ru:119
* Trying 127.0.0.1:18888...
* TCP_NODELAY set
* SOCKS5 communication to news.rusnet.ru:119
* SOCKS5 connect to IPv4 195.208.113.96:119 (locally resolved)
* SOCKS5 request granted.
* Connected to 127.0.0.1 (127.0.0.1) port 18888 (#0)
^C
Regards
-- Assoc. Prof. Hongyi Zhao <hongyi.zhao_at_gmail.com> Theory and Simulation of Materials Hebei Polytechnic University of Science and Technology engineering NO. 552 North Gangtie Road, Xingtai, China ----------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-users Etiquette: https://curl.haxx.se/mail/etiquette.htmlReceived on 2021-03-18