[webservices] null returns from fdsnws-station service [SEC=UNCLASSIFIED]

[Philip Crotwell]

Hi

If you are querying the web services programmatically instead of
within a web browser, then you have to check the return code. The
default for the fdsn web services is to return a 204 status code for
queries that return no data.

You might try adding nodata=404 to your queries, at least for testing
purposes in the browser.  Unfortunately, 204 tells the browser "don't
update the current display", so it looks like nothing happened. Not
the best choice IMHO. A 205 would have been better as it would have at
least caused a page refresh, but it is what it is.

Philip

On Thu, Sep 11, 2014 at 3:16 AM,  <Matthew.Hoyles at ga.gov.au> wrote:
> Hello iris webservices,
>
>
>
> Some of our queries to the fdsnws station service are returning nothing.
> This only happens for certain stations and certain time periods, and with
> matchtimeseries=TRUE.
>
>
>
> For example this returns nothing:
>
> http://service.iris.edu/fdsnws/station/1/query?loc=00&end=2014-09-10T09%3A47%3A11&sta=BJT&level=chan&matchtimeseries=TRUE&net=IC&start=2014-09-10T09%3A27%3A11
>
>
>
> But this (without the matchtimeseries=TRUE) returns XML:
>
> http://service.iris.edu/fdsnws/station/1/query?loc=00&end=2014-09-10T09%3A47%3A11&sta=BJT&level=chan&net=IC&start=2014-09-10T09%3A27%3A11
>
>
>
> As does this (with matchtimeseries=TRUE, but 3 days earlier):
>
> http://service.iris.edu/fdsnws/station/1/query?loc=00&end=2014-09-07T09%3A47%3A11&sta=BJT&level=chan&matchtimeseries=TRUE&net=IC&start=2014-09-07T09%3A27%3A11
>
>
>
> Does this lack of results mean that none of the channels have data for the
> time period selected? Is this a bug or expected behaviour?
>
>
>
> Regards,
>
> Matthew
>
>
>
> Matthew Hoyles
> Senior Software Developer  |  Software Development and Support
>
> ICT Innovation and Services  |  GEOSCIENCE AUSTRALIA
>
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