Documentation forServer & Application Monitor

HTTP Monitor

The HTTP Monitor is a SAM component monitor that is also available as a SAM template that tests a web server's ability to accept incoming sessions and transmit the requested page. The component monitor can optionally search the page for specific text strings and then pass or fail the test based on that search.

The HTTP Monitor measures the time it takes the web page referenced in the component monitor to load. Response time is measured in milliseconds.

If a web page redirects to another page, the response time measures the entire time from the original request until the last redirected page is loaded.

This monitor supports the following additional macros:

  • ${Node.SysName}
  • ${Node.Caption}
  • ${Node.DNS}
  • ${Node.ID}

Statistic

This component monitor does not compute a statistic.

Polling using Orion agent for Linux

Only Basic and Digest authentication are supported when this probe runs using Orion agent for Linux.

For Kerberos authentication on Linux-based systems, select Agentless as the Preferred Polling Method.

Field descriptions

Description

A default description of the monitor. You can override the default description by adding or replacing the text, which is automatically saved. The variable to access this field is ${UserDescription}.

Enable Component

Determines whether the component is enabled. Disabling the component leaves it in the application in a deactivated state not influencing either SolarWinds SAM application availability or status.

Credential for Monitoring

If the web site is password-protected, select a credential that can access the web site, or use the <Inherit credential from node> option. If the credential you need is not in the credentials list, add it in the Credentials Library. See Understand the Credentials Library for details.

If the web site is not password protected, do not specify a credential.

Port Number

The port used for the web site. The default value is 80.

Url

Specify the URL you want to monitor. Variables contained in the default value for this field attempt to monitor a web site at the IP address of the assigned node ${IP} and on the port specified in the Port Number field ${PORT}.

Note: To prevent proxy servers from caching the monitored URL, you can append a unique query string to the URL with the ${TimeStamp} variable.

Example "cache buster" for simple URL: http://${IP}:${Port}/?_cb=${TimeStamp}

Example "cache buster" for URL with existing query string:
http://${IP}:${Port}/?page.aspx?var=value&_cb=${TimeStamp}

Host Header

Enter the address of the host header. For example, www.solarwinds.com.

Host Request

Enter the type of content. For example, POST.

Follow Redirect

Specify the component monitor to automatically follow server-side redirects.

Use Proxy

Select "Use Proxy" to use a web proxy to access the web site.

Proxy Address

Specify the address of a web proxy to access the web site.

User Agent

Emulate a specific user agent or browser type when contacting the web site. For example, to emulate Internet Explorer version 7, type Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0). For more information about user agent strings, see http://www.useragentstring.com

Search String

Provide the text string that indicates successful page retrieval. If the specified string is found in the web page content, the monitor is considered up.

The search string is not case-sensitive.

Fail if Found

Select "Yes" to reverse the default behavior of the search string. If the search string is found in the web page content, the monitor is considered down instead of up.

Head Request

This field allows you to ensure the web site responds to the HTTP protocol, but without checking the validity of the web page content. Search strings are ignored if you select this option.

Accept Compression

Indicates if compression is supported.

Response Time Threshold

Set the warning or critical threshold conditions based on the response time. The response time is the time in milliseconds it takes SAM to determine that a component is not Down and to retrieve any statistical data. See Application Monitor Thresholds.

User Notes

Add notes for easy reference. You can access this field by using the variable, ${UserNotes}.