[mrtg] Re: MRTG & PNG images: browser failing to refresh

[Mark Ganzer]

No, I am not using RRDTool/14all.cgi. I've tried using the "WriteExpires"
option, however it doesn't appear that the Netscape Enterprise web server uses
the resulting meta files. The main reason I asked this question is that I
never had problems with the images automatically updating in my browser every
5 minutes when I had MRTG using GIF files. However they no longer do so after
converting to use PNG files, and I wasn't sure if it was a problem with how
the browser supported PNG files, or whether it was a problem on the server
side.  If Apache does properly update PNG's when using MetaFiles, then it
sounds like I need to dig into the Netscape web server some more to find the
problem.

-Mark Ganzer

Rainer Bawidamann wrote:

> In article <39E33F82.3637896B at spawar.navy.mil>,
>         ganzer at spawar.navy.mil ("Mark T. Ganzer") writes:
> >
> > While on the subject of GIF vs PNG images, has anyone using MRTG with
> > PNG images had problems getting their web browsers to refresh
> > automatically (or even manually)?  I am running MRTG 2.8.11 on a Sun
> > Enterprise Server and Netscape Enterprise web server. The index pages
> > and interface display just fine, however after that they will not
> > update. About the only way I can force a refresh is to clear the browser
> > cache, then reload the pages. Kind of a pain...
>
> Do you use only mrtg or in combination with 14all (UseRRDTool: yes)?
>
> If you use only mrtg the html pages should have "Refresh" and "Expires"
> headers. If you enable "WriteExpires: 1" you will get "meta" files for
> your graph files (i.e. for a file "x-daily.png" you will get a
> "x-daily.png.meta"). You have to tell your web server to use these files
> (apache: MetaFiles: on).
>
> Rainer
> --
> Rainer.Bawidamann at rz.uni-ulm.de
>
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