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Code Issues Releases Wiki Activity

Mention various caveats related to accept/reject lists.

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Micah Cowan 2008-03-24 12:26:37 -07:00
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2 changed files with 47 additions and 2 deletions
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@ -1,3 +1,9 @@
2008-03-24 Micah Cowan <micah@cowan.name>
* wget.texi <Types of Fields>: Mentioned various caveats in the
behavior of accept/reject lists, deprecate current
always-download-HTML feature.
2008-03-17 Micah Cowan <micah@cowan.name>
* wget.texi <Directory-Based Limits>: Mention importance of

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doc/wget.texi
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@ -2125,8 +2125,47 @@ better fine-tuning of which files to retrieve. E.g. @samp{wget -A
a part of their name, but @emph{not} the PostScript files.
Note that these two options do not affect the downloading of @sc{html}
files; Wget must load all the @sc{html}s to know where to go at
all---recursive retrieval would make no sense otherwise.
files (as determined by a @samp{.htm} or @samp{.html} filename
prefix). This behavior may not be desirable for all users, and may be
changed for future versions of Wget.
Note, too, that query strings (strings at the end of a URL beginning
with a question mark (@samp{?}) are not included as part of the
filename for accept/reject rules, even though these will actually
contribute to the name chosen for the local file. It is expected that
a future version of Wget will provide an option to allow matching
against query strings.
Finally, it's worth noting that the accept/reject lists are matched
@emph{twice} against downloaded files: once against the URL's filename
portion, to determine if the file should be downloaded in the first
place; then, after it has been accepted and successfully downloaded,
the local file's name is also checked against the accept/reject lists
to see if it should be removed. The rationale was that, since
@samp{.htm} and @samp{.html} files are always downloaded regardless of
accept/reject rules, they should be removed @emph{after} being
downloaded and scanned for links, if they did match the accept/reject
lists. However, this can lead to unexpected results, since the local
filenames can differ from the original URL filenames in the following
ways, all of which can change whether an accept/reject rule matches:
@itemize @bullet
@item
If the local file already exists and @samp{--no-directories} was
specified, a numeric suffix will be appended to the original name.
@item
If @samp{--html-extension} was specified, the local filename will have
@samp{.html} appended to it. If Wget is invoked with @samp{-E -A.php},
a filename such as @samp{index.php} will match be accepted, but upon
download will be named @samp{index.php.html}, which no longer matches,
and so the file will be deleted.
@item
Query strings do not contribute to URL matching, but are included in
local filenames, and so @emph{do} contribute to filename matching.
@end itemize
This behavior, too, is considered less-than-desirable, and may change
in a future version of Wget.
@node Directory-Based Limits
@section Directory-Based Limits