Changes between Version 9 and Version 10 of GZIPFilter


Ignore:
Timestamp:
03/23/09 22:10:36 (16 years ago)
Author:
simonp
Comment:

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  • GZIPFilter

    v9 v10  
    2727
    2828== Motivations ==
    29 Compression of HTTP responses from GeoNetwork will speed up page refreshes and reduce the network footprint required to run GeoNetwork - see overview above.
     29Compression of HTTP responses from !GeoNetwork will speed up page refreshes and reduce the network footprint required to run !GeoNetwork - see overview above.
    3030
    3131== Proposal ==
    … …  
    3333A GZIP compression filter has been written for general use by the people at jspbook.com - [http://www.onjava.com/pub/a/onjava/2003/11/19/filters.html Two servlet filters every web app should have] - this filter has been adapted for use in GeoNetwork and some issues that caused trouble in Internet Exploder has been fixed. The filter will only be applied to requests that can accept gzip compression and to requests that are not asking for an image (trapped using suffixes) or for a resource such as a thumbnail or download file as all of these are almost always compressed anyway.
    3434
    35 One other function that may prove to be useful has been added to the filter. This function sets the expiry date on certain types of content (javascript, css, locale images) into the far future. The idea here is that this content will not be downloaded each time a user returns to a previously loaded page - instead this content will be found either in the web browser or proxy cache. The down side with this feature (apart from whether it really saves all that much anyway) is that the URLs of the static content need to change (eg. by adding ?version=whatever to javascript tags) when a new version of GeoNetwork is released to avoid stale static content being retrieved from the cache. This is not implemented in GeoNetwork and whether it is worth it will depend upon further testing of the worth of this feature.
     35One other function that may prove to be useful has been added to the filter. This function sets the expiry date on certain types of content (javascript, css, locale images) into the far future. The idea here is that this content will not be downloaded each time a user returns to a previously loaded page - instead this content will be found either in the web browser or proxy cache. The down side with this feature (apart from whether it really saves all that much anyway) is that the URLs of the static content need to change (eg. by adding ?version=whatever to javascript tags) when a new version of !GeoNetwork is released to avoid stale static content being retrieved from the cache. This is not implemented in !GeoNetwork and whether it is worth it will depend upon further testing of the worth of this feature.
    3636
    3737Steps needed to insert compression filter in servlet path. This involves modifications to web/geonetwork/WEB-INF/web.xml and web/intermap/WEB-INF/web.xml as follows: