What's actually happening is that the SourceForge server is sending the
Content-Length header twice. Here are the headers I'm seeing, as
captured by tcpflow:
GET /plugin.conf HTTP/1.0
Host: hplip.sourceforge.net
User-Agent: Python-urllib/1.17
HTTP/1.1 200 OK
Server: Apache/2.2.3 (CentOS)
Last-Modified: Thu, 17 Mar 2011 06:58:02 GMT
ETag: "1b8e-49ea82eb2b4d9"
Content-Length: 7054
Expires: Sat, 26 Mar 2011 00:02:02 GMT
Content-Type: text/plain
Content-Length: 7054
Date: Thu, 24 Mar 2011 00:02:02 GMT
X-Varnish: 1348565344
Age: 0
Via: 1.1 varnish
Connection: close
This is disallowed by HTTP/1.1. RFC2616 defines Content-Length thus in
section 14.13:
Content-Length = "Content-Length" ":" 1*DIGIT
but in section 4.2:
Multiple message-header fields with the same field-name MAY be
present in a message if and only if the entire field-value for that
header field is defined as a comma-separated list [i.e., #(values)].
It MUST be possible to combine the multiple header fields into one
"field-name: field-value" pair, without changing the semantics of the
message, by appending each subsequent field-value to the first, each
separated by a comma. The order in which header fields with the same
field-name are received is therefore significant to the
interpretation of the combined field value, and thus a proxy MUST NOT
change the order of these field values when a message is forwarded.
My reading is therefore that hplip.sourceforge.net is in violation of a
MUST in RFC2616 and the client has no obligation to work around it,
although some clients (e.g. Firefox) appear to do so. This should be
reported to SourceForge.
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https://bugs.launchpad.net/bugs/740140
Title:
hp-plugin -i plugin download error
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