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What is a HAR file?Ī HAR (short for HTTP Archive) file is a JSON file containing all information about a browser’s interactions with a page. So how do we keep track of what is being analyzed by the Network tab? By exporting the page in HAR format. Performance improvements are noticeable by changes in your code/environment. Last, but not least, the waterfall column demonstrates when the asset is loaded along with the other requests. The size value will present the gzipped size of the resource (when applicable), while the time column shows the total duration from the start of the request to the receipt of the final byte in the response. The size, time and waterfall columns will be crucial to understanding the performance of a page. You can add more information to this table by right-clicking one of the table headers and choosing other columns. It will also show you relevant information about the origin of those assets (domain, HTTP status code, size), who initiated the request, and the order in which they were loaded in a waterfall representation. The network tab will give you a table containing all assets loaded on the page. I think about looking at the requests of a page, understanding what resources are being loaded, and how long these resources take to be available to users. Ensure that your session is being captured (represented by an arrow icon in the Network tab as seen above).When I consider the performance of a website, several things come to mind.Deselect the option to Clear entries on navigate by clicking the icon pictured below:.In the Developer Tools panel, click the Network tab.By default, the panel will open on the bottom of the IE window. In IE, hit the F12 key to launch Internet Explorer's Developer Tools console.When you have successfully reproduced the issue, right-click on any of the logged events in the Web Developer panel and click Save All as HAR.Ensure that the Persist Logs option is checked.By default, the panel will open on the bottom of the Firefox window. In Firefox, hit Ctrl-Shift-E to open the Web Developer Network console.attach the saved HAR file to your support case.When you have successfully reproduced the issue, right-click on any of the logged events in the Developer Tools panel and click Save as HAR with Content.Browse to the Domain/Application/URL where the issue is being encountered and perform whatever steps are necessary to reproduce it.If any events appear in the Developer Tools panel, click the Clear button to the right of the circle icon to remove them from the log.If the circle is black, click it until it becomes red. ensure that the circle icon in the upper-left of the Developer Tools pane is red, which indicates that your browser activity is now being recorded as a log.In the Developer Tools panel, click on the Network tab.By default, the panel will open on the right side of the Chrome window. In Chrome, hit the F12 key or Ctrl-Shift-I to launch Chrome's Developer Tools console.Here are the procedures to generate HAR files on the most common browser platforms, Chrome/Firefox and IE.
#Har viewer chrome full
A great example of what the various HAR file fields report is shown here, which includes the break down the various stages of a browser request to Web server, from the DNS request, to the TCP connection, SSL handshake to finally sending the request and getting the initial and full response They provide useful information from all major browsers about HTTP request parameters, as well as status responses and payloads.
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HAR files are a major source of information when troubleshooting Web based issues.