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Change the way bans/purges are stored, so that each ban has a list of
conditions to test.

This paves the way for a much more expressive ban/purge syntax where
things like:

        purge req.http.host ~ "web1.com" && req.url ~ "\.png"
        purge obj.age > 1w && obj.size > 1MB
        purge obj.http.set-cookie ~ "USER=838339" && req.url ~ "\.html"

become possible.

Not quite there yet though.



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Fixes #376

Addendum to r3501: remove the file from the list.



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Don't panic if the chunked header is ridiculously long, just fail
the transaction.

Fixes #387



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If we get more HTTP headers than we have room for (default: 28) we
used to ignore the rest.

This is not a bright solution if crucial HTTP headers like
"Content-Length" or "Transfer-Encoding" are last and get ignored.

In general, it is highly suspect to randomly ignore HTTP headers,
as opposed to deliberately ignoring them, either by having first
looked at them and found them uninteresting, or by having looked
for the headers we care about, and having not matched some others.

Change too many headers to firm error condition: 400 if from the
client, and 503 (like every other trouble) if from the backend.

Fixes #416



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Give it proper semantics



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Remove pointless initialization.

Fix indentation.



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Check close(2) status.
Assert that we read the C-source file.



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Generate VCL_RET_* as enumbering instead of bitmap, compensate
elsewhere as required.

Remove unecessary args to VCL_[RM]ET_MAC().

Rely on VCL_RET_* definition in vcl.h

Adjust to VCL_RET_* being enum instead of bitmap.

This solves the "restart" procaction issue in a non-hackish way
and looks better overall.



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Only fail -T argument if none of the addresses it resolves to
can be listend on.

Fixes #97



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The new logic is:
        If (HEAD)       /* happens only on pass */
                do not fetch body.
        else if (Content-Length)
                fetch body according to length
        else if (chunked)
                fetch body as chunked
        else if (other transfer-encoding)
                fail
        else if (Connection: keep-alive)
                fetch no body, set Length = 0
        else if (Connection: close)
                fetch body until EOF
        else if (HTTP < 1.1)
                fetch body until EOF
        else
                fetch no body, set Length = 0

let me know if this breaks anything that should work.

Fixes #400



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