Regular Expression for RegexUrlNormalizer to remove jsessionid

• Key: NUTCH-255
• Type: Improvement
• Status: Closed
• Resolution: Duplicate
• Priority: Trivial
• Assignee: Unassigned
• Reporter: Dennis Kubes
• Component/s: fetcher
• Affects Version/s: 0.8

Description

Some URLs are filtered out by the crawl url filter for special characters (by default). One of these is the jsessionid urls such as:

http://www.somesite.com;jsessionid=A8D7D812B5EFD3099F099A760F779E3B?query=string

We want to get rid of the jessionid and keep everything else so that it looks like this:

http://www.somesite.com?query=string

Below is a regular expression for the regex-normalize.xml file used by the RegexUrlNormalizer that sucessfully removes jsessionid strings while leaving the hostname and querystring. I have also attached a patch for the regex-normalize.xml.template file that adds the following expression.

<regex>
<pattern>(.)(;jsessionid=[a-zA-Z0-9]{32})(.)</pattern>
<substitution>$1$3</substitution>
</regex>

Comments

[Dennis Kubes]

Patch file that adds regular expression to remove jsessionid strings from urls to the regex-normalize.xml.template file.

[Stefan Neufeind]

You might want to have a / right after the .com in the example - but that's not too important here
You can also omit the (.*) at beginning/end of expression as it's not needed for this task

NUTCH-279 includes your patch modified in there.
PS: Thanks for the contribution.

[Andrzej Bialecki]

Duplicate of NUTCH-279 .