3cc490d4c4
Composer has always allowed a single http_proxy (or CGI_HTTP_PROXY) environment variable to be used for both HTTP and HTTPS requests. But many other tools and libraries require scheme-specific values. The landscape is already complicated by the use of and need for upper and lower case values, so to bring matters inline with current practice https_proxy is now required for HTTPS requests. The new proxy handler incorporates a transition mechanism, which allows http_proxy to be used for all requests when https_proxy is not set and provides a `needsTransitionWarning` method for the main application. Moving to scheme-specific environment variables means that a user may set a single proxy for either HTTP or HTTPS requests. To accomodate this situation during the transition period, an https_proxy value can be set to an empty string which will prevent http_proxy being used for HTTPS requests. |
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