perf(CAPTCHA): verify CAPTCHA responses using subrequests instead of libcurl
#140
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Introducing multi-threading for CPU intensity work in the Nginx makes no sense.
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libcurllibcurl
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Summary
This module needs to send HTTP requests to the CAPTCHA server to verify if the CAPTCHA passes. Currently, this was done by the
libcurl, but this blocks the event loop of the Nginx, so replacing it with subrequests is more efficient.