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WebPageTest Gatherer

Overview

For more details on the WebPageTest API, please check out the official documentation.

Below is a sample Test with webpagetest property that defines the configuration for running a WebPageTest audit.

{
  "label": "Example",
  "url": "https://example.com",
  "gatherer": "webpagetest",
  "webpagetest": {
    "settings": {
      "locationId": "Dulles_MotoG",
      "device": "Pixel",
      "connection": "4G",
      "runs": 1,
      "repeatView": true,
      "timeline": true,
      "block": null,
      "script": null
    }
  }
}

Required Environmental Variables

  • GCP_PROJECT_ID - The project unique ID in the Google Cloud Platform.
  • SERVICE_ACCOUNT_CREDENTIALS - The path to the Service Account json file.

Audit Lifecycle

A WebPageTest run may take a few minutes to complete, depending on the parameters like number of runs, locations, repeat views, etc.

Hence, the auditing model is asynchronous. After executing a run action, WebPageTeset won't return the metric values immediately. Instead, it is required to execute a retrieve action to retrieve the metric values.

The following CLI example explains the two-steps approach:

# Run tests
./awp run --tests=examples/tests.json --results=output/results.json

# Retrieve results
./awp retrieve --tests=examples/tests.json --results=output/results.json

Configuration details

  • settings : The settings is an object that defines a list of parameters for running a WebPageTest audit. See the following parameters for details.
  • settings.locationId : Location ID, used as the location parameter in the WebPageTest RESTful API.
  • settings.connection : Network connection speed, like 3G or 4G. This will be used as the connectivity parameter in WebPageTest RESTful API.
  • settings.device : Mobile device name, as the mobileDevice parameter in WebPageTest RESTful API.
  • settings.runs : Number of runs per audit, the same as in runs parameter in the WebPageTest RESTful API.
  • settings.repeatView : Whether to include repeat view test in the WebPageTest report. This will be used for fvonly in the WebPageTest RESTful API. Please note that if repeatView is set to true, fvonly will be 0, and vise versa.
  • settings.timeline : Whether to include the timeline view in the WebPageTest report, used as timeline in WebPageTest RESTful API.
  • settings.block : Whether to block specific assets from network requests. This will be used as block in WebPageTest RESTful API.
  • settings.script : Whether to run custom steps in a WebPageTest audit. This will be used as script in WebPageTest RESTful API.

    • Run a Test

    After running, the webpagetest object in a Result object will contain the metadata object and its corresponding values, like below:

    {
  "label": "Example",
  "url": "https://example.com",
  "status": "Retrieved",
  "webpagetest": {
    "settings": {
      "locationId": "Dulles_MotoG",
      "device": "Pixel",
      "connection": "4G",
      "runs": 1,
      "repeatView": true,
      "timeline": true,
      "block": null,
      "script": null
    },
    "metadata": {
      "testId": "someTestId",
      "ownerKey": "someKey",
      "jsonUrl": "https://webpagetest.org/jsonResult.php?test=someTestId",
      "xmlUrl": "https://webpagetest.org/xmlResult/someTestId/",
      "userUrl": "https://webpagetest.org/result/someTestId/",
      "summaryCSV": "https://webpagetest.org/result/someTestId/page_data.csv",
      "detailCSV": "https://webpagetest.org/result/someTestId/requests.csv"
    }    
  }
}

    These metadata will be used to retrieve metrics.

    Retrieve Metrics

    After retrieving, the webpagetest object in a Test object will contain the metrics object and its corresponding values, like below:

    {
  "label": "Example",
  "url": "https://example.com",
  "webpagetest": {
    "settings": {
      "locationId": "Dulles_MotoG",
      "device": "Pixel",
      "connection": "4G",
      "runs": 1,
      "repeatView": true,
      "timeline": true,
      "block": null,
      "script": null
    },
    "metadata": {
      "testId": "someTestId",
      "ownerKey": "someKey",
      "jsonUrl": "https://webpagetest.org/jsonResult.php?test=someTestId",
      "xmlUrl": "https://webpagetest.org/xmlResult/someTestId/",
      "userUrl": "https://webpagetest.org/result/someTestId/",
      "summaryCSV": "https://webpagetest.org/result/someTestId/page_data.csv",
      "detailCSV": "https://webpagetest.org/result/someTestId/requests.csv"
    },
    "metrics": {
      "lighthouse": {
        "Performance": 0.97,
        "ProgressiveWebApp": 0.38,
        "FirstContentfulPaint": 1805.008,
        ...
      },
      "FirstContentfulPaint": 692,
      "SpeedIndex": 702,
      ...
    }
  }
}

    Since the WebPageTest provides both built-in metrics as well as Lighthouse metrics, there will be a lighthouse property containing the Lighthouse metrics.