Dan, thanks for responding.
The software is written in Eiffel, with which I would guess you are
not familiar. And you would need to read through a significant
number of classes to get the overall picture.
I have discovered the problem only occurs when using libevent2 to
drive the multi interface. There is no issue using the easy interface
directly, nor using `multi_poll'.
Looks like a problem with my use of the sockets interface, but curious
that it doesn't hang when using TOR as a proxy.
FWIW, here are the options being set on the easy handle:
CURLOPT_VERBOSE: 1
CURLOPT_IPRESOLVE: CURL_IPRESOLVE_V4
CURLOPT_PROXY: either "" or "socks5h://127.0.0.1" depending on TOR use.
CURLOPT_PROXYPORT: 0 or 9150
CURLOPT_HTTPPROXYTUNNEL: 0 or 1 (1 for TOR, 0 otherwise)
CURLOPT_TIMEOUT: 0
CURLOPT_CONNECTTIMEOUT: 0
CURLOPT_FOLLOWLOCATION: 0
CURLOPT_HTTP_VERSION: CURL_HTTP_VERSION_1_1
CURLOPT_SSLVERSION: CURL_SSLVERSION_MAX_TLSv1_2
CURLOPT_SSL_VERIFYPEER: 0
CURLOPT_SSL_VERIFYHOST: 0
CURLOPT_HTTPAUTH: CURLAUTH_NONE
CURLOPT_URL: "https://example.com"; or similar
CURLOPT_HTTPGET: 1
-- MS
On 21/10/2020 17:42, Dan Fandrich via curl-library wrote:
On Wed, Oct 21, 2020 at 03:50:00PM +0100, MS via curl-library wrote:
Gisle: thank you for your response.
Let's focus on the different behaviour with IPv4:
Using libcurl in an application, without firewall
operating, attempting to connect to bbc.co.uk,
I obtain a hang with
* Trying 151.101.64.81:80...
the only output written.
Using curl.exe I obtain
curl -v -4 bbc.co.uk
* Trying 151.101.64.81:80...
* Connected to bbc.co.uk (151.101.64.81) port 80 (#0)
GET / HTTP/1.1
Host: bbc.co.uk
User-Agent: curl/7.71.0-DEV
I only have one dll in the system, which I have verified
both applications are loading.
How could I investigate the reason for the difference
in behaviour? It can't fundamentally be ISP related,
since curl.exe gets through.
With thanks again for any ideas!
The application could be setting all kinds of options that prevent a transfer
from succeeding or preventing log messages from being generated. Can you show
us the failing code?
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