Mirroring HTML Files Only

Suppose you only want to crawl URIs that match http://foo.org/bar/\*.html.  Also, you would like to save the crawled files in a file/directory format instead of saving them in WARC files.  Also, assume the web server is case-sensitive.  For example, http://foo.org/bar/abc.html and http://foo.org/bar/ABC.HTML are pointing to two different resources.

First, create a job with a single seed, http://foo.org/bar/.  Configure the warcWriter bean so that its class is org.archive.modules.writer.MirrorWriterProcessor.  This Processor will store files in a directory structure that matches the crawled URIs.  The files will be stored in the crawl job's mirror directory.

The following DecideRules should be configured in the rules property of the scope bean.

1. RejectDecideRule
2. SurtPrefixedDecideRule
3. TooManyHopsDecideRule
4. PathologicalPathDecideRule
5. TooManyPathSegmentsDecideRule
6. NotMatchesFilePatternDecideRule
7. PrerequisiteAcceptDecideRule

Use the NotMatchesFilePatternDecideRule to keep from crawling any URIs that don't end with .html.  It is important that this DecideRule be placed immediately before the PrerequisiteAcceptDecideRule.  Otherwise, the DNS and robots.txt prerequisites will be rejected since they won't match the regular expression.

For the NotMatchesFilePatternDecideRule set the following property values:

1. decision: REJECT
2. usePreset: CUSTOM
3. regex: .*(/|\.html)$

Note that the regexp will accept URIs that end with a "/" as well as ".html."  If we don't accept the "/" character, the seed URI will be rejected.  This also allows us to accept URIs like http://foo.org/bar/dir/, which are likely pointing to an index.html.  A stricter regexp would be .*\.html$, but the seed URI must be changed if this regexp is used.  Be aware that if Heritrix encounters a URI like http://foo.org/bar/dir where dir is a directory, the URI will be rejected since it is missing the terminating slash.

Finally, Heritrix must be configured to differentiate between abc.html and ABC.HTML.  Do this by removing the LowercaseRule from the canonicalizationPolicy bean.