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#### 4.1.1.12 HAPI

HAPI, the Heliophysics Data Application Programmer's Interface is a protocol for serving streamed time series data. This reader can read HAPI CSV and binary tables if they include header information (the `include=header` request parameter must be present). An example HAPI URL is

       https://vires.services/hapi/data?dataset=GRACE_A_MAG&start=2009-01-01&stop=2009-01-02&include=header

While HAPI data is normally accessed directly from the service, it is possible to download a HAPI stream to a local file and use this handler to read it from disk.

This format cannot be automatically identified by its content, so in general it is necessary to specify that a table is in HAPI format when reading it. However, if the input file has the extension "`.hapi`" (case insensitive) an attempt will be made to read it using this format.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk