<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: HTTP Webpage Sensor

Performance impact

This sensor has a high performance impact.

Browser

This sensor requires that Google Chrome is installed on the probe system and available for all users. If you use this sensor in a cluster, Google Chrome must be installed on all cluster nodes.

For more information on how the sensor finds a Google Chrome executable, see Google Chrome below.

Smart URL replacement

This sensor supports smart URL replacement.

IPv6

This sensor supports IPv6.

Scanning interval

This sensor has a fixed minimum scanning interval for performance reasons. You cannot use a shorter scanning interval. Consequently, shorter scanning intervals in the Monitoring settings are not available for this sensor.

• The minimum scanning interval of this sensor is 1 minute.
• The recommended scanning interval of this sensor is 5 minutes.

Limits

This sensor has predefined limits for one or several metrics.

URL

Enter the full URL of the webpage that you want to monitor. The default URL is https://%host/. The sensor resolves %host as the parent device's IP address or DNS name.

If you enter an absolute URL, the sensor uses this address independently of the IP Address/DNS Name setting of the parent device.

The URL must be URL encoded. The URL must start with http:// or https://.

PRTG uses a smart URL replacement with which you can use the parent device's IP address or Domain Name System (DNS) name setting as part of the URL. For more information, see section Smart URL Replacement.

Remote Debugging Port

Select the Chrome DevTools Protocol (CDP) port that this sensor uses:

• 9222 (default)
• Custom

Each sensor instance must use a unique unoccupied port. If multiple sensors use the same port, scan failures occur when their scans overlap.

Custom Debugging Port

This setting is only visible if you select Remote Debugging Port above.

Enter the port number for the CDP debugging interface. PRTG supports port numbers 1 - 65535.

Page Load Timeout (Sec.)

Enter the maximum allowed time in seconds for the request. The check request includes Google Chrome startup, CDP connection, and page load. The default timeout is 20 seconds. The maximum timeout is 300 seconds (5 minutes).

Certificate Validation

Select whether the sensor validates the webpage certificate:

• Validate certificates (default): Enforce Secure Sockets Layer (SSL)/Transport Layer Security (TLS) certificate validation. The sensor enters the Down status if it cannot validate a certificate.
• Do not validate certificates: Ignore SSL/TLS certificate errors. Select this option if the webpage that you want to monitor uses self-signed certificates or is an internal webpage that you trust.
  This disables TLS certificate validation entirely for Google Chrome when it loads the webpage. We do not recommend that you ignore certificate errors on external or public-facing URLs.

Viewport Size

Select the viewport size that Google Chrome uses to render the page:

• 390x844: Simulates a typical mobile screen.
• 1920x1080 (default): Simulates a full HD desktop screen.
• 2560x1440: Simulates a QHD desktop screen.

Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor.

You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.

Graph Type

Define how this sensor shows different channels:

• Show channels independently (default): Show a graph for each channel.
• Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
  You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Result Handling

Define what PRTG does with the sensor result:

• Discard result (default): Do not store the sensor result.
• Store result: Store the sensor result and the last response in the \Logs\sensors subfolder of the PRTG data directory on the probe system. The file name is Result of Sensor [ID].log. This setting is for debugging purposes. PRTG overwrites this file with each scanning interval.

This option is not available when the sensor runs on the hosted probe of a PRTG Hosted Monitor instance.

In a cluster, PRTG stores the result in the PRTG data directory of the master node.

Downtime

In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status.

Page Load Time

The loading time of the webpage

This channel has default limits:

• Upper error limit: 10000 msec
• Upper warning limit: 5000 msec

This channel is the primary channel by default.