Calling remote services from within eXist XQuery

  • Enable the optional httpclient module in conf.xml ... look for optional modules , search for httpclient .. you will notice that the are by default disabled. You just need to pull the necessary tags out of the comment lines. 
                <module class="org.exist.xquery.modules.httpclient.HTTPClientModule"
                    uri="http://exist-db.org/xquery/httpclient" />
  • Declare namespace like this: 
    declare namespace httpclient="http://exist-db.org/xquery/httpclient";
  • Call your service like this: 
    let $stuff-from-post:=httpclient:post(xs:anyURI
("http://ptx-lab:8080/exist/rest//db/proptax/crv/resources/queries/echo.xq")
,<Hello>Arun</Hello>,false(),<Headers/>)

    Here I am calling a remote eXist xquery exposed as a RESTful service.

  • While the above does a HTTP Post, the snippet below is for HTTP GET 
    let $stuff-from-get := 
httpclient:get(xs:anyURI("http://www.google.com"),true(),<Headers/>)

The echo.xq looks like this (assumes a lot...but is ASAP - as simple as possible):

xquery version "1.0";

declare namespace xmldb="http://exist-db.org/xquery/xmldb";
declare namespace util="http://exist-db.org/xquery/util";
declare namespace request="http://exist-db.org/xquery/request";

declare option exist:serialize "method=xml media-type=text/xml indent=yes omit-xml-declaration=no";

let $data := request:get-data()
return
<Data>
{$data}
</Data>

Labels

exist exist Delete
xquery xquery Delete
rest rest Delete
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