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Apache (csws) PDF JPG GIF file size limited

Posted: Fri Mar 26, 2021 3:31 pm
by cfd
After upgrade from HP vms8.3-1 and HP CSWSv2.2-1 (2014)
to VSI vms8.4-2L1 and VSI CSWSv2.4-3 on a rx2800,
web files larger than 55 blocks (estimated) are not delivered intact to various browsers.

For example, a 181.block GIF file appears blank on Firefox, but appears 1/2 OK and 1/2 missing on Chrome.
PDF files saved by Firefox can not be opened by Acrobat ("damaged").
The web site is presently http rather than https .
No errors appear in the Apache error lots.

Any suggestions as to (e.g.) Apache httd.conf settings which might mitigate this
error would be greatly appreciated.

Re: Apache (csws) PDF JPG GIF file size limited

Posted: Sat Mar 27, 2021 5:13 pm
by hein
May we assume that the test involved exactly the same files, before and after the upgrade?

Any C-RTL logicals configured such as
for details see-

Are there any (RMS) errors to be found in the logs?

The 55 blocks mentioned is relatively close to the RMS maximum record size of 32767 (64 blocks minus 1 byte)
What are the typical file attributes for files to be served up? Stream_lf? fixed-512?

If a stream_lf file is read in RECORD mode, then you would expect it to fail when larger than 64 block due to 'missing terminator', but all sorts of errors may be reported.

Here is one way to test this.
Create a large file with 'raw' data simply by using a large fixed length (even preferred) record size:

$ conv/fdl="rec; form fix; size 30000"/pad="X" tt: tmp.tmp/stat

Now read it with the C-rtl for example using Perl

$ perl -ne "$len +=length }{ print qq(len=$len, recs=$.)" tmp.tmp
len=90003, recs=3

3 records as expected, and dhose 3 bonus bytes? "free" semi-instantiated record terminators

Now fake it as a stream_lf file which the C-rtl will treat as a byte stream file:

$ set file/attr=rfm=stmlf tmp.tmp
$ perl -ne "$len +=length }{ print qq(len=$len, recs=$.)" tmp.tmp
len=90000, recs=1


Now try RMS .... all sorts of errors:

%TYPE-W-READERR, error reading TMP.TMP
-RMS-W-RTB, 90000 byte record too large for user's buffer
%TYPE-F-WRITEERR, error writing NL:[]TMP.TMP;
-RMS-F-RSZ, invalid record size

$ searc/log/win=0 tmp.tmp ""
%SEARCH-I-TRUNCATE, record(s) in TMP.TMP truncated to 32768 bytes
%SEARCH-S-MATCHED, TMP.TMP - 1 record, 1 match

$ conv/stat tmp.tmp nl:/fdl=nl:
%CONVERT-I-RTL, record longer than maximum record length
$ dir/size new.tmp,tmp.tmp;

Good luck!

Re: Apache (csws) PDF JPG GIF file size limited

Posted: Sat Mar 27, 2021 5:19 pm
by brett.cameron
That's a very old CSWS version (V2.4-3) and I seem to recall that this might have been a known issue. Suggest using a later kit ( ... D-1.ZIPEXE).

Re: Apache (csws) PDF JPG GIF file size limited

Posted: Sat Mar 27, 2021 8:26 pm
by cfd
The newer VSI-I64VMS-CSWS-V0204-38D-1 install kit seems to have completely solved the problem.

Brett, thanks for the pointer to the kit. I note that the I640842L1U1 install kit for VSI-VMS presently includes the old CSWSv0204-3-1 kit, and the recent i640842LP disc does not include CSWS.

Hein, thanks for the interesting suggestions for RMS tests. I learned a little, but as a physicist with 30 years VMS "management-as-needed", RMS still stands for Root.Mean.Square :)

Thanks again; a clean-runnign VMS is a wonderful thing.