Hi, I have successfully used APIs for simple HTTP GET requests.

However, at the moment I am trying to download a table (or the whole site) from https://st.hwmonline.com/DG/Secure/SitesList.aspx where monitor sensor information (name, id, address) is stored.

The problem is that when I call that URL (together with authentication headers) only the first 50 sites are shown. There are however thousands which I need access to. Entering the site via browser, there is a button 'show all sites' below the table which I need to somehow pass into my HTTP caller.

This is an excerpt of the source code that refers to said button. When trying to put "dropMessagesNumber=0" into the header nothing happens:

<select 

name="ctl00$ContentPlaceHolder1$siteListInfo$dropMessagesNumber" onchange="javascript:setTimeout('__doPostBack(\\'ctl00$ContentPlaceHolder1$siteListInfo$dropMessagesNumber\\',\\'\\')', 0)" id="dropMessagesNumber" style="width:200px;">

<option value="1">Show 50 Sites Per Page</option>

<option value="2">Show 100 Sites Per Page</option>

<option value="3">Show 200 Sites Per Page</option>

<option value="4">Show 300 Sites Per Page</option>

<option selected="selected" value="0">Show All Sites</option>

</select>

Any ideas how I can formulate my request or a hint that it is not at all possible are appreciated.

Cheers,

Marvin