On Tue, Sep 21, 2021 at 12:35:31AM -0400, Abhinav Singhal via curl-library 
wrote:
> I'm tasked to upgrade the curl version at work from the current 7.71 to the
> latest 7.79.0. The issue I am running into is that one of the tests that
> validates whether an http proxy server is running by sending it a dummy url is
> failing with this error:
> 
> Error: command failed: HTTP proxy configuration is invalid. Reason: Empty
> reply from server
> 
> The expected HTTP error message for this operation is 403 (forbidden), but the
> server is not returning anything. The same code works perfectly fine with
> 7.71.1. 

Are you saying the server returns something with 7.71.1 but doesn't return
anything with 7.79.0?  Have you looked at a trace of the requests to see what
is different between the two versions?
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