$Web Num Hdr: Difference between revisions
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{{DISPLAYTITLE:$Web_Num_Hdr}} | {{DISPLAYTITLE:$Web_Num_Hdr}} | ||
<span class="pageSubtitle" | <span class="pageSubtitle">Number of fields in request header</span> | ||
$Web_Num_Hdr retrieves the number of fields in a request header. | <var>$Web_Num_Hdr</var> retrieves the number of fields in a request header. | ||
$Web_Num_Hdr takes a single optional argument and returns a number. | <var>$Web_Num_Hdr</var> takes a single optional argument and returns a number. | ||
==Syntax== | ==Syntax== | ||
<p class="syntax">< | <p class="syntax"><span class="term">%count</span> = <span class="literal">$Web_Num_Hdr</span>( [<span class="term">fieldname</span>] ) | ||
< | </p> | ||
===Syntax terms=== | ===Syntax terms=== | ||
| Line 30: | Line 30: | ||
==See also== | ==See also== | ||
<ul> | <ul> | ||
<li><var>[[$Web_Hdr_Len]]</var> | <li><var>[[$Web_Hdr_Len]]</var> | ||
<li><var>[[$Web_Hdr_Name]]</var> | <li><var>[[$Web_Hdr_Name]]</var> | ||
<li><var>[[$Web_Hdr_Parm]]</var> | <li><var>[[$Web_Hdr_Parm]]</var> | ||
</ul> | </ul> | ||
[[Category:Janus Web Server $functions|$Web_Num_Hdr]] | [[Category:Janus Web Server $functions|$Web_Num_Hdr]] | ||
Latest revision as of 00:59, 16 April 2013
Number of fields in request header
$Web_Num_Hdr retrieves the number of fields in a request header.
$Web_Num_Hdr takes a single optional argument and returns a number.
Syntax
%count = $Web_Num_Hdr( [fieldname] )
Syntax terms
| fieldname | Specifies to count only the header fields that match fieldname. If omitted, returns the count of all header fields. |
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Examples
While many header fields are handled "under the covers" by Janus Web Server, there might be useful application level information in some header fields. The following code shows how an application might use the $Web_Num_Hdr function to send the contents of all header fields to the audit trail. While this could be done with JANUS TRACE settings, it might be useful to do this on an application level.
IF %BAD_REQUEST THEN %H_COUNT = $Web_Num_Hdr FOR %X FROM 1 TO %H_COUNT AUDIT $Web_Hdr_Parm(, %X) END FOR %rc = $Web_Done(500, 'Bad header data received') STOP END IF