bugGNU Wget - Bugs: bug #40819, wget does not send Accept-Encoding...

 
 

bug #40819: wget does not send Accept-Encoding and fails to handle Content-Encoding

Submitted by:  Noël Köthe <nok>
Submitted on:  Thu 05 Dec 2013 09:28:45 PM UTC  
 
Category: Protocol IssueSeverity: 3 - Normal
Priority: 5 - NormalStatus: None
Privacy: PublicAssigned to: None
Originator Name: Open/Closed: Open
Release: trunkOperating System: GNU/Linux
Reproducibility: NoneFixed Release: None
Planned Release: NoneRegression: None
Work Required: NonePatch Included: No

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Thu 05 Dec 2013 09:28:45 PM UTC, original submission:

Hello,

a forwarded bug from a Debian user: http://bugs.debian.org/731110

--8<--
I observed that wget downloads "wrong" content from a squid cache. Both tools operate within the bounds of RFC2616, but the resulting combination is wrong. Consider the following interaction:

A http client that supports Accept-Encoding and Content-Encoding
downloads an object via a squid3 proxy. An encoding that is not the identity encoding is chosen and the response is considered cacheable by squid3. At a later time wget is instructed to retrieve the same object via the same proxy. Unlike the other client wget does not send an Accept-Encoding header. The squid3 proxy exercises an assumption explicitly granted by RFC2616 14.3:

| If no Accept-Encoding field is present in a request, the server MAY
| assume that the client will accept any content coding.

It thus sends back the cached object including the Content-Encoding header, but wget does not handle the header and stores the object in compressed form.

Note that RFC2616 goes on to say:

| In this case, if "identity" is one of the available content-codings,
| then the server SHOULD use the "identity" content-coding, unless it has
| additional information that a different content-coding is meaningful to
| the client.

So arguably squid3 is violating a SHOULD clause and should be fixed.

A simple mechanism to resolve the situation is to make wget send an empty Accept-Encoding header by default or setting its value to "identity".

Helmut
--8<--

Thank you.

Noël Köthe <nok>

 

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Carbon-Copy List
  • -unavailable- added by darnir
  • -unavailable- added by nok (Submitted the item)
  • -unavailable- added by nok
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    Follow 2 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Fri 17 Jan 2014 06:02:22 AM UTCdarnirCarbon-Copy-=>Added -unavailable-
    Thu 05 Dec 2013 09:28:45 PM UTCnokCarbon-Copy-=>Added -unavailable-

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