[Smwg] TGFT - a couple of points.

Colin.Haddow at esa.int Colin.Haddow at esa.int
Thu Dec 21 17:10:42 UTC 2017

Dear all,
                 I've finally had some time (necessary as I'm certainly 
not an http server guru and getting Apache set up is not intuitively 
obvious...) to play around with http and WebDav (Using Apache 2.4 on SLES 
12) and can report the following;

With respect to the possible 4GByte file size limit we had some concerns 
about my tests on the afore mentioned platform indicate that this is not 
an issue. I uploaded a 5.7GBytes file successfully.
With the implementation of both the PUT and POST methods that come with 
WebDav in Apache 2.4 if a file with the same name as an existing file is 
uploaded then the existing file is overwritten. So some sort of naming 
convention will be required.

Now a question for all of you to consider over the Festive break (at least 
those of you that are not already on holiday). We had identified WebDav 
back in the early days of the TGFT concept, however since then things have 
changed and we now only need one operation, http PUT or POST (probably 
PUT). Both of these are in the basic http specification, i.e. WebDav is 
not required for them. So the question is do we really need WebDav or 
should we just use http/https ?, its worth noting however that as far as I 
can tell, and if anybody knows differently please correct me, that at 
least in Apache if WebDav is not used it is necessary to provide scripts 
to implement PUT and POST.

To be discussed at our January WebEx I guess.

Anyway a Merry Christmas and a Happy New Year to one and all.


Dr. Colin R. Haddow,
HSO-GI, European Space Agency,
European Space Operations Centre,
Robert-Bosch-Str 5,
64293 Darmstadt,

Phone; +49 6151 90 2896
Fax;      +49 6151 90 3010
E-Mail;  colin.haddow at esa.int

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