Which LWP version are you using? As of the 6.x series, PERL_LWP_USE_HTTP_10 is gone. And the HTTP/1.0 implementation has been split into a separate, deprecated release. (HTTPS has also been split out to keep the core LWP dependency chain down.)

In reply to Re: Forcing HTTP/1.0 and mangling headers by tobyink
in thread Forcing HTTP/1.0 and mangling headers by yam

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