Fabian Sauter

Thanks for your well written issue! It looks to me like this is an issue of [zlib-ng](https://github.com/zlib-ng/zlib-ng), we are using as a faster drop in replacement for curl. Until I...

Interesting... Later this week I will try to play around with it on my own since a own quite a couple of PIs, so I can quickly evaluate stuff there.

Currently impossible due to: https://github.com/curl/curl/issues/8741 An update would break HTTPS on Windows.

The issue is, that you are probably using cpr on Windows, right? The error you get lets you know that you used up all free source ports on your system....

One option would be to reuse `cpr::Session` when ever possible. As soon as you call the destructor of `cpr::Session` resources should be freed automatically.

Hi @erkska thanks for reporting this! We actually have a test case for this here: https://github.com/libcpr/cpr/blob/7938bc7702130f989b76822909b57b829dcd806a/test/ssl_tests.cpp#L132-L151 There we use the following example certificate for testing: https://github.com/libcpr/cpr/blob/master/test/data/certificates/root-ca.crt Is there any chance...

In fact, you are right with that! Probably over the weekend I have more time to look deeper into this.

I'm currently working in a separate branch on this: https://github.com/libcpr/cpr/tree/CaBufferFix I was able to reproduce this bug and I already fixed one related bug. But the main issue is still...

Aha! Yes, you are right. The reason we are setting `BUILD_TESTING` here to OFF is to prevent curl from building its test cases. @Leon0402 would you like to create a...

CPR itself uses the `CPR_BUILD_TESTS` variable to determine if we should build tests.