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What does the Cloud HTTP sensor measure as Response Time

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The Cloud HTTP Sensor, (currently in Beta: http://www.paessler.com/manuals/prtg/cloud_http_sensor), is returning a "Response Time" channel.

What is the measure behind this metric: "time to first byte", "document load", or something else?

Thanks Thomas

cloud-http cloud-sensor http https prtg-cloud

Created on May 6, 2015 4:52:05 PM by  tbl-ldc (60) 1



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Document load is the time it took to load the entire page without it's linked assets (i.e. css files). Wikipedia defines the Time-To-First-Byte like this:


Time To First Byte

...is a measurement that is often used as an indication of the responsiveness of a webserver or other network resources.

It is the duration from the virtual user making an HTTP request to the first byte of the page being received by the browser. This time is made up of the socket connection time, the time taken to send the HTTP request, and the time taken to get the first byte of the page.

Link to full article


What other metrics were you talking about? :)

Created on May 12, 2015 1:14:30 PM by  Stephan Linke [Paessler Support]



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Hi Stephan,

Thanks but I know what TTFB and Document Load mean, the question is:

The Cloud HTTP Sensor [...] is returning a "Response Time" channel. What is the measure behind this ["Response Time"] metric?

Thanks Thomas

Created on May 12, 2015 2:42:31 PM by  tbl-ldc (60) 1



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Well you asked for it :)

The response time represents the time the server took to fully process the requested page (i.e. deliver it to the client) until a response code is sent to the client. More on that can be found here.

Created on May 13, 2015 10:53:17 AM by  Stephan Linke [Paessler Support]



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Thanks Stefan, that's what I was looking for: the time between the request sent and the document is fully downloaded. Can you confirm that the test doesn't load extra elements, just the main page? (e.g. CSS, JS, etc.)

I'm looking for equivalence between the Catchpoint metrics and the PRTG cloud HTTP sensor.

I realise that my question was confusing, sorry about that.

Created on May 13, 2015 1:26:56 PM by  tbl-ldc (60) 1



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As far as I know, assets are not loaded - I'll ask the developer just to make sure :)

Update
Just asked the developer - all assets are loaded, just like when you load the file in a browser. The only exception are javascripts, they're not executed. Additionally, the request has to be completed within 5,000ms :)

Created on May 14, 2015 7:58:20 AM by  Stephan Linke [Paessler Support]

Last change on May 14, 2015 8:21:41 AM by  Stephan Linke [Paessler Support]



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