[Geoserver-users] Content Length HTTP header

Andrea Aime

2017-07-03 18:22:46 UTC

Post by Ben Jerrim
Hey guys, i've noticed that the content-length HTTP header is not passed in
the tomcat response from geoserver (not using geowebcache). I'm trying to
use it to hack around an issue with a client library to pass a 204 if
there's no content.
I'm assuming that the response is streamed and that tomcat (geoserver?)
never has the entire message in memory so the header is not added. Just want
to confirm that if possible?

Yes, all outputs are built on the fly and written directly to the output
stream, so
there is no (simple, general) way to know size in advance

Post by Ben Jerrim
Would adding geowebcache to the landscape help
this if the tile is read from disk?

Indeed it shoould, here are the headers from a GWC tile response:

http://demo.geo-solutions.it/geoserver/gwc/service/wms?LAYERS=topp%3Astates&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A4326&BBOX=-101.25,33.75,-90,45&WIDTH=256&HEIGHT=256

HTTP/1.1 200 OK Date: Mon, 03 Jul 2017 18:22:04 GMT
Access-Control-Allow-Origin: * Access-Control-Allow-Headers: Origin,
X-Requested-With, Content-Type, Accept, Host Set-Cookie:
GS_FLOW_CONTROL="GS_CFLOW_65bfefe4:15d0898c703:-6bca"; Version=1
X-Control-flow-delay-ms: 0 geowebcache-tile-index: [7, 11, 4]
Cache-Control: max-age=3600, must-revalidate Expires: Mon, 03 Jul 2017
19:22:04 GMT geowebcache-cache-result: HIT geowebcache-tile-index: [7, 11,
4] geowebcache-tile-bounds: -101.25,33.75,-90.0,45.0 geowebcache-gridset:
EPSG:4326 geowebcache-crs: EPSG:4326 Last-Modified: Wed, 28 Jun 2017
16:13:26 GMT Content-Disposition: inline; filename=geoserver-dispatch.image
Content-Type: image/png *Content-Length: 14121* Keep-Alive: timeout=5,
max=100 Connection: Keep-Alive

Hope this helps
--
Regards,

Andrea Aime

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Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
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