#NETWORK BANDWIDTH HOW TO#
#NETWORK BANDWIDTH CODE#

DevTools filters out any resource with a filename that doesn't end with a j or a c followed by 1 or more s characters. In this case the only files that match the filter are the PNG images. Only the files that contain the text png are shown. The Filter text box supports many different types of filtering. # Filter by string, regular expression, or property The Filters toolbar should be enabled by default. A search result highlighted in the Headers tabĬlose the Search pane and the Timing tab.ĭevTools provides numerous workflows for filtering out resources that aren't relevant to the task at hand. If the query was found in content, the Response tab opens.įigure 21. If the query was found in a header, the Headers tab opens. Search results for Cache-ControlĬlick a result to view it. The Search pane lists all instances of Cache-Control that it finds in resource headers or content.įigure 20. The Search pane opens to the left of the Network log. Use the Search pane when you need to search the HTTP headers and responses of all resources for a certain string or regular expression.įor example, suppose you want to check if your resources are using reasonable cache policies.Ĭlick Search. A breakdown of the network activity for this resource is shown.Ĭlick Close to view the Network Log again. Tip When a file is minified, clicking the Format button at the bottom of the Response tab re-formats the file's contents for readability.Ĭlick the Timing tab.

#NETWORK BANDWIDTH CODE#

This tab is helpful when an API returns an error code in HTML and it's easier to read the rendered HTML than the HTML source code, or when inspecting images.Ĭlick the Response tab. Use this tab to inspect HTTP headers.Ĭlick the Preview tab. The network activity that was happening during the first screenshotĬlick Capture Screenshots again to close the Screenshots pane.Ĭlick a resource to learn more information about it.

DevTools shows you what network activity was occurring at that moment in time.įigure 13. The Screenshots pane provides thumbnails of how the page looked at various points during the loading process.Ĭlick the first thumbnail.

#NETWORK BANDWIDTH HOW TO#

See Simulate a slower connection if you need a reminder on how to do this. Reload the page again via the Empty Cache And Hard Reload workflow. Screenshots let you see how a page looked over time while it was loading. Note The Empty Cache And Hard Reload workflow is only available when DevTools is open. Hover over a Waterfall to see a breakdown. A graphical representation of the different stages of the request. Clicking a link in the Initiator column takes you to the source code that caused the request. The bottom resource is whatever was requested last.Įach column represents information about a resource. The top resource is usually the main HTML document. By default the resources are listed chronologically. The Network panel logs all network activity in the Network Log.Įach row of the Network Log represents a resource. To view the network activity that a page causes: That's because DevTools only logs network activity while it's open and no network activity has occurred since you opened DevTools.

DevTools docked to the bottom of the window DevTools docked to the bottom of the windowĬlick the Network tab. You might prefer to dock DevTools to the bottom of your window.įigure 4. Open DevTools by pressing Control+Shift+J or Command+Option+J (Mac). The demo in one window and this tutorial in a different window You might prefer to move the demo to a separate window.įigure 2. To get the most out of this tutorial, open up the demo and try out the features on the demo page. Start with the Audits panel because it gives you targeted suggestions on how to improve your page. There are many types of load performance issues that aren't related to network activity. If you're looking for ways to improve page load performance, don't start with the Network panel.

Inspecting the properties of an individual resource, such as its HTTP headers, content, size, and so on.

Making sure that resources are actually being uploaded or downloaded at all.

The most common use cases for the Network panel are: In general, use the Network panel when you need to make sure that resources are being downloaded or uploaded as expected.

Network bandwidth