Zope.publisher

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- LP 122054: ``HTTPInputStream`` understands both the CONTENT_LENGTH and
HTTP_CONTENT_LENGTH environment variables. It is also now tolerant
of empty strings and will treat those as if the variable were
absent.

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- Fix caching issue. The input stream never got cached in a temp file
because of a wrong content-length header lookup. Added CONTENT_LENGTH
header check in addition to the previous used HTTP_CONTENT_LENGTH. The
``HTTP_`` prefix is sometimes added by some CGI proxies, but CONTENT_LENGTH
is the right header info for the size.

- LP 98413: ``HTTPResponse.handleException`` should set the content type