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14.3.4. /INLINEFILE HTTP Server Pseudo-Directory

This pseudo directory provides a way for a VSP page to have full control over the data sent to the client user-agent, for example to send files to it and to handle the HTTP response attributes.

URIs starting with /INLINEFILE are handled through a VSP procedure instead of being searched for in the HTTP root directory. This special URI has the following syntax:

/INLINEFILE/some_file_name?VSP=some_vsp&arg1=x&arg2=y.....

Upon receipt of such a URI, Virtuoso will execute the "some_vsp" VSP page with the parameters following the VSP parameter. The VSP page can adjust the HTTP response header attributes using the http_header() function to reflect the content of the HTTP body, such as specifying the encoding through "Content-Encoding" attribute, or a MIME type through "Content-Type" attribute).

Example 14.9. Using /INLINEFILE

Here is a simple example for showing JPEG images stored in DAV. The page will list the first ten images found in the DAV resources table as hyper-links. Clicking on them will fetch the content and display using /INLINEFILE.

<?vsp
  if ({?'getfile'} <> '')
    {
      http_header ('Content-type: image/jpg\t\n');         -- set the header to jpg
      declare image any;
      select RES_CONTENT into image from WS..SYS_DAV_RES
        where RES_ID = atoi({?'id'});                      -- download image from WebDAV
      http(image);                                         -- table and display
      return;
    }
  ?>
<html>
 <body>
 <h1>Using /INLINEFILE to display images from the database</h1>

 <table>
  <tr>
   <td>

<?vsp for (select top 10 RES_ID, RES_NAME from WS..SYS_DAV_RES where right(RES_NAME, 3) = 'jpg') do {?>
 <a href="?id=<?=RES_ID?>"><?=RES_NAME?></a><br>
<?vsp } ?>

   </td>
   <td>
    <p><img src="/INLINEFILE/picture.jpg?VSP=<?/http_path()?>&getfile=yes&id=<?={?'id'}?>"></p>
    <p><a href="/INLINEFILE/picture.jpg?VSP=<?/http_path()?>&getfile=yes&id=<?/{?'id'}?>">download</a></p>
   </td>
  </tr>
 </table>
 </body>
</html>
[Note] Note:

Note the use of the http_path() function to find the full path of the originating VSP file.

Also note the call to http_header() to set the appropriate content type for the returned data. When Virtuoso retrieves files normally, it will consult the system table WS.WS.SYS_DAV_RES_TYPES for types based on the file extension. We do not need to refer to the table in our example because we are making sure that only JPEGs are being returned.

[Tip] See Also:

http_header()

http_path()

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