On Sat, 21 May 2022, Fabian Keil via curl-library wrote:
The recently added tests 412 and 413 fail when using Privoxy as proxy. Looking at the trace output it seems that curl is tunnelling the requests when --proxy is being used even though it's vanilla http:// and not https://:
...
Is that the expected behaviour or a bug?
It sounds like a bug. But we only allow alt-svc for HTTP in debug-builds (with the necessary environment variable set) for testing, so in a release build this would never happen...
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