We have a reporting tool here that produces the reports as pdfs. It has
always worked with internet explorer but not with firefox or mozilla
until recently, with both of them giving the message "File does not
start with %PDF". Recent updates to mozilla and firefox have meant that
about 75% of the reports will now open in all browsers. After seeing
this thread I have just modified the compression filter we use to not
compress servlets with a name ending in .pdf (we map the report
producing servlet to getrep.pdf to make sure Internet Explorer realises
that it is getting a pdf file - not all versions will honour the mime type).
Now all reports are correctly displayed in all browsers. I've had a
look at the gains we were getting with the compressed pdfs and it was
only about 5% on average so removing compression is not going to be noticed.
In summary, it appears that firefox and mozilla do not fully support
compressed pdfs.
Jan Pernica wrote:
Anyway the browser does not display PDF correctly if it is compressed.
Regards
Jan
Sonja Löhr wrote:
Thanks to you all!
If the improvement is so small I will unplug the filter. Although the
browsers do support compression (the filter is checking this), the
outcome seems to be somewhat unpredictable, and I don't know anything
about the client side in production, of course.
sonja
Am Montag, den 19.09.2005, 21:48 +0200 schrieb J.Pietschmann:
Sonja Löhr wrote:
With IE (that is, acrobat inside) I get sometimes the pdf and
sometimes a
blank page, after reloading the message about a "damaged file". Firefox
(always) complains that the file "doesn't begin with %PDF-" (ok,
indeed both
speak German ;-)
The browser explicitly asks if it will accept a compressed
response. The server is *not* allowed to use compression (at the
HTTP level) if the browser doesn't ask for it. Check your browser
configuration. In Firefox, you might try the HTTP live headers
extension for sniffing the actual values.
Also, most of the PDF parts are already compressed (and re-encoded
as ASCII85). A secondary compression will probably gain something
between 15% and 20% for typical PDF files. Significant improvements
are only to be expected in case of large embedded BMP images and in
some cases if there are large embedded fonts.
J.Pietschmann
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