![\"What](\"https:\/\/www.keycdn.com\/img\/support\/har-file.png\")
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What is a HAR file?<\/p>\n
HAR stands for HTTP Archive and is a container for lots of trace information from within a browser. It records all web requests made\u00a0by the browser tab, including the request & response headers, the body\u00a0and the time it look to load. This makes HAR files very useful when troubleshooting issues relating to speed, caching and issues which are harder to replicate.<\/p>\n
Security warning:<\/strong> How to generate one<\/p>\n Currently, only two browsers have the feature built in, others need an add-on or extension, or can\u2019t do this at all. When installing an add-on or extension, follow the instructions given by the browser, and make sure you understand the implications, especially in terms of performance and security.<\/p>\n In Chrome<\/p>\n 1. Browse to the URL where you are seeing the issue.<\/p>\n 2. Right click anywhere on the page and click on Inspect Element.<\/p>\n 3. The developer tools should have opened at the bottom of the browser, now click on the Network tab.<\/p>\n 4. Click on the record button and force a refresh of the page, or click on a link with which you are seeing the issue. The aim is to reproduce the issue and capture the output.<\/p>\n 5. Once you have experienced the issue, right click on any of the items within the Network tab and select \u201cSave as HAR with Content\u201d then save the file.<\/p>\n 6. Now you can upload the output file to your support ticket or attach it to an email response.<\/p>\n In Firefox<\/p>\n 1. Browse to the URL where you are seeing the issue.<\/p>\n 2. Navigate to the Tools > Web Developer > Network menu or press Ctrl+Shift+I (Windows\/Linux) or Cmd+Option+I (OS X)<\/p>\n 3. Refresh the page to start capturing the traffic between the browser to the server, or click on a link with which you are seeing the issue. The aim is to reproduce the issue and capture the output.<\/p>\n 4. Click on Export followed by Save As\u2026 to save the HAR file.<\/p>\n In Internet Explorer (after version 11)<\/p>\n
\nA HAR file captures all information a user submits via a web page while network traffic is being recorded. This can include passwords, payment information, and private keys.\u00a0Be cautious when generating a HAR file that includes this information, and never send a HAR file with sensitive information over email.<\/strong>\u00a0 You can manually remove all sensitive information using a text editor.<\/p>\n