https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/request_list/#filtering-by-properties Firefox Source Docs Logo Quick search Overview * A Glossary of Common Terms * A Quick Guide to Mozilla Applications Getting Started * Getting Set Up To Work On The Firefox Codebase Working On Firefox * Working on Firefox * Bug Handling Firefox User Guide * Firefox DevTools User Docs Source Code Documentation * Governance * Firefox Front-end * DOM * Editor * Style system (CSS) & Layout * Graphics * Processes, Threads and IPC * Firefox DevTools Contributor Docs * Toolkit * SpiderMonkey * GeckoView * Fenix * Focus for Android * WebIDL * libpref * Networking * Remote Protocols * Services * File Handling * Firefox on macOS * Firefox on Windows * Firefox AI Platform * Accessibility * Code quality * Writing Rust Code * Rust Components * Gecko Profiler * Performance * Database bindings (SQLite, KV, ...) * XPCOM * NSPR * Network Security Services (NSS) * Web Security Checks in Gecko The Firefox Build System * Mach * Pushing to Try * Build System * Firefox CI and Taskgraph * Managing Documentation * Vendoring Third Party Components Testing & Test Infrastructure * Automated Testing * Understanding Treeherder Results * Sheriffed intermittent failures * Turning on Firefox tests for a new configuration * Avoiding intermittent tests * Testing Policy * Configuration Changes * Browser chrome mochitests * Chrome Tests * Marionette * geckodriver * Test Verification * WebRender Tests * Mochitest * XPCShell tests * TPS * web-platform-tests * GTest * Fuzzing * Sanitizer * Performance Testing * Code coverage * Testing & Debugging Rust Code Releases & Updates * Mozilla Update Infrastructure * Watershed Updates * Desupport Updates Localization & Internationalization * Internationalization * Localization Firefox and Python * mozbase * Using third-party Python packages Metrics Collected in Firefox * Metrics Firefox Source Docs * * Network request list * Report an issue / View page source --------------------------------------------------------------------- Network request listP The request list of the Network Monitor shows a list of all the network requests made in the course of loading the page. Network request listP By default, the Network Monitor shows a list of all the network requests made in the course of loading the page. Each request is displayed in its own row: ../../../_images/network_request_list.png By default, the Network Monitor is cleared each time you navigate to a new page or reload the current page. You can override this behavior by checking "Enable persistent logs" in the Settings. Network request columnsP You can toggle columns on and off by right-clicking on the table header and choosing the specific column from the context menu. A Reset Columns command is available on the context menu to reset the columns to their initial configuration. You can also change the width of the columns to help make the information you are looking for easier to view. The mouse pointer changes to a resize icon when you move it over the border of a column. You can drag to manually set the size of column. Starting in Firefox 76 you can double-click a column divider to resize the column to the left of it to fit its contents. The Reset Columns command on the context menu also resets the width of the columns to the default values. Clicking the column header label sorts the request list by that column. You can reset the sort to the default by selecting "Reset Sorting" from the context menu. Screenshot of the context menu for selecting columns to display in the Network monitor Here is a list of all available columns: * Status: The HTTP status code returned. The numeric code is displayed on a colored background, to help unusual ones stand out. If there was no response, this column is empty. Or you might see a Red circle with a diagonal slash red circle with a diagonal slash for responses that were blocked by the browser or the server. * Method: The HTTP request method used. * Domain: Domain of the path requested. + If the request used SSL/TLS and the connection had security weaknesses such as weak ciphers, you'll see a warning triangle next to the domain. Y + Hover over the domain to see the IP address. + There's an icon next to the domain that gives you extra information about the security status of that request. See Security icons. * File: The basename of the file requested. + (Starting in Firefox 80) On the right edge of the File column, a turtle icon appears if the server waiting time exceeds a threshold (default: 500 ms). A tooltip explains the problem. You can configure the threshold in the Configuration Editor (about:config) by modifying the devtools.netmonitor.audits.slow setting. + Screenshot of a network request with a turtle icon, and a tooltip explaining the problem * URL: The URL of the file requested. * Protocol: The network protocol used to transfer the data, this column is hidden by default. * Scheme: The scheme (https/http/ftp/...) of the path requested. This column is hidden by default. * Remote IP: The IP address of the server answering the request. This column is hidden by default. * Type: Content-type of the response. * Cookies: The number of request cookies associated to the request. This column is hidden by default. This is new in Firefox 55. * Set-Cookies: The number of response cookies associated to the request. This column is hidden by default. This is new in Firefox 55. * Transferred: The number of bytes that were actually transferred to load the resource, or a message about why the resource was not transferred. A number value is less than Size if the resource was compressed. + If the resource was fetched from a service worker cache, then this cell displays "service worker". + Cached resources may be fetched from the cache and the network simultaneously, which may improve load time for slow caches. Starting with Firefox 68, the transferred column lists either "cached (raced)" or "[size] (raced)" depending on the faster source. This feature is called Race Cache With Network (RCWN). + If the resource was blocked, the message indicates why it was blocked. For example, "CSP", "Malware", "CORS Missing Allow Origin", "Blocked by [Name of Extension]". * Size: The size of the transferred resource. Image thumbnailsP If the request is for an Image, hovering over its filename shows a preview of the image in a tooltip: ../../../_images/image_preview.png Security iconsP The Network Monitor displays an icon in the Domain column: ../../../_images/network_message_list_63.png This gives you extra information about the security status of the request: Icon Meaning image3 HTTPS image4 Weak HTTPS (for example, a weak cipher was used) image5 Failed HTTPS (for example, a certificate was invalid) image6 HTTP image7 Localhost image8 Indicates that the URL belongs to a known tracker that would be blocked with content blocking enabled. TimelineP The request list also displays a timeline for the different parts of each request. ../../../_images/timeline.png Each timeline is given a horizontal position in its row relative to the other network requests, so you can see the total time taken to load the page. For more details on the color-coding used here, see the section on the Timings page. Starting in Firefox 45, the timeline also contains two vertical lines: * The blue line marks the point at which thepage's DOMContentLoaded event is triggered. * The red line marks the point at which the page's load event is triggered. Blocking specific URLsP If you want to view your page as it would look without a resource (e.g., if it were blocked by the browser or an extension), you can block requests matching patterns you specify. 1. Click the Request Blocking icon in the toolbar. This opens the Blocking sidebar. (Click the icon again when you want to close the sidebar.) Screen shot of the Blocking panel, with arrows indicating the panel and the Request Blocking toolbar icon 2. Enter a string in the field with the placeholder text Block resource when URL contains. 3. Reload the page to test it with the specified URL blocked. Other actions you can take with Request Blocking: * To turn all request blocking off or on: Toggle the checkbox next to Enable Request Blocking. * To turn a specific block off or on: Toggle the checkbox next to that item. * To delete a blocked item, click the X icon that appears when you focus the item. * (Starting with Firefox 77) Right-click any item in the list and choose from the context menu: + Enable all enables blocking of all items in the list. + Disable all disables blocking of all items in the list. + Remove all deletes all items in the list. Blocking a specific URL from the request listP You can also block a URL from the request list: ../../../_images/beforeblocking.png 1. Hover over the item you want to block in the Request List. 2. Select Block URL from the context menu. 3. When you refresh the page, that specific URL will be blocked and a message will be added to the item in the list indicating that it has been blocked by the DevTools. ../../../_images/afterblocking.png Stop blocking a URL from the Request ListP ../../../_images/unblockurl.png 1. Hover over the item. 2. Select Unblock URL. 3. Now when you refresh the page, the item will once enabled. Note (Starting in Firefox 80) You can also block and unblock URLs from the Web Console, using the :block and :unblock helper commands. These accept any string, and affect any URL containing the string. Filtering requestsP You can filter requests by content type, by whether they are XMLHttpRequests or WebSocket requests, or by request properties. Filter type How to apply Content Use the buttons in the toolbar (HTML, CSS, JS). type XHR Use the XHR button in the toolbar. requests Use the WS button in the toolbar. You can filter by plain text (in which case the text is used to find partial matches; entering "for" will match any message that contains the word "for") or--as of Firefox 75 -- using regular expressions (by writing the regexp bracketed WebSocket within slashes; "/.+Corp.*/" will look for any occurrence connections of "Corp" which has at least one character before it and may or may not have any characters after it, for example). The third-party add-on WebSocket Sniffer may be helpful as well. Use the Filter URLs box in the toolbar. You can focus it by clicking in the filter box, or by pressing Ctrl + F (or Cmd + F on a Mac); then start typing. The list of network requests is filtered to include only requests that contain your filter string, in either the Domain or URL the File portions. You can filter requests that don't contain your filter string by prefixing your query with the "-" operator. For example, the query "-google.com" will show all requests that don't have "google.com" in the URL. Request Use the search box in the toolbar. See next section. properties Filtering by propertiesP The search box recognizes specific keywords, which can be used to filter the requests by specific request properties. Those keywords are followed by a colon and a related filter value. The filter values are matched case insensitive. Prepending a minus (-) negates the filter. You can combine different filters together by separating them with a space. Keyword Meaning Examples Shows resources that status-code have the status-code:304 specific HTTP status code. Shows resources that have were method requested via method:post the specific HTTP request method. Shows resources domain coming from a domain:mozilla.org specific domain. Shows resources remote-ip:63.245.215.53 remote-ip coming from a server with remote-ip: the specified [2400:cb00:2048:1::6810:2802] IP. Shows resources matching a cause:js specific cause cause type. The cause:stylesheet types can be found in the cause:img description of the cause column. Shows resources having a specific transferred size or a transferred size close to the one transferred specified. k transferred:1k can be used as suffix for kilobytes and m for megabytes, e.g. the value 1k is equivalent to 1024. Shows resources having a specific size (after decompression) or a size close to the size one specified. size:2m k can be used as suffix for kilobytes and m for megabytes, e.g. the value 1k is equivalent to 1024. Shows resources that are larger than the specified size in bytes. k can be used as larger-than:2000 larger-than suffix for kilobytes and -larger-than:4k m for megabytes, e.g. the value 1k is equivalent to 1024. Shows mime-type:text/html resources that mime-type match the mime-type:image/png specified MIME type. mime-type:application/javascript is:cached and is:from-cache shows only resources coming from cache. is:cached is is:running shows only -is:running resources, which are currently being transferred. Shows resources scheme transferred scheme:http via the given scheme. Shows resources that has-response-header:cache-control has-response-header contain the specified HTTP has-response-header:X-Firefox-Spdy response header. Shows the resources that have a Set-Cookie set-cookie-domain header with a set-cookie-domain:.mozilla.org Domain attribute that matches the specified value. Shows the resources that have a Set-Cookie set-cookie-name header with a set-cookie-name:_ga name that matches the specified value. Shows the resources that have a Set-Cookie set-cookie-value header with a set-cookie-value:true value that matches the specified value. Shows the resources having a URL regexp:\d{5} regexp that matches the given regexp:mdn|mozilla regular expression. For example, to find all 404, not found, errors, you can type "404" into the search and auto-complete suggests "status-code:404" so you'll end up with something like this: ../../../_images/404_filter.png Search in requestsP Use the Search panel to run a full-text search on headers and content. 1. Click the Search icon in the toolbar. This opens the Search sidebar. Screenshot of the Network monitor, with the request search sidebar displayed, and arrows indicating the search toolbar icon and the search box. 2. Enter a string in the search field of the sidebar, and press Enter or Return. The search results area below the search field displays the requests that contain that string in the request or response headers or in the content of the response. You can expand each item to show the specific item that matches the string. Clicking an item in the search results highlights that item in the monitor list, and displays the corresponding information in the request details pane. Screenshot of the search panel, with "newsletter" as the search string, and callouts for the expanded results, and corresponding items displayed in the request list and headers tab. Other ways to use the search panel: * To clear the search string: click the X icon in the search field. * To make the search case sensitive: click the Case Sensitive (Aa) icon next to the search field. * To close the search panel, do one of the following: + Click the X icon next to the search field. + Click the Search icon in the Network Monitor toolbar. Context menuP Context-clicking on a row in the list displays a context menu with the following options: Menuitem Description Copy > Copy Copies the URL. URL Copy > Copy Copies the network request to the clipboard as a cURL as cURL command, so you can execute it from a command line. See Copy as cURL, below. Copy > Copy Copies the request as a call to the fetch() method, including the URL and any settings object. Copy > Copy Request Copies the request's header to the clipboard. Headers Copy > Copy Copies the headers of the response for this request, to Response the clipboard. Headers Copy > Copy Copies the entire response that was sent for this Response request. Copy > Copy Creates an HTTP Archive (HAR) for all requests listed, All As HAR and copies it to the clipboard. Save All As Creates an HTTP Archive (HAR) for all requests listed, HAR and opens a file dialog, so you can save it to a file. Resend Resends the request as it was originally sent with no changes made. Edit and Opens an editor enabling you to edit the request's Resend method, URL, parameters, and headers, and resend the request. Block URL Blocks the selected URL for future requests. See Blocking a specific URL from the Request List. Open in New Resends the request in a new tab -- very useful for Tab debugging asynchronous requests. Open in Style For a CSS resource, opens it in the Style Editor. Editor Start Performance Analysis Use as Fetch Submits the request as a call to the fetch() method in the console. Copy as cURLP The command may include the following options: -X [METHOD] If the method is not GET or POST --data For URL encoded request parameters --data-binary For multipart request parameters --http/ If the HTTP version is not 1.1 VERSION -I If the method is HEAD One for each request header. -H If the "Accept-Encoding" header is present, the cURL command includes --compressed instead of -H "Accept-Encoding: gzip, deflate". This means that the response will be automatically decompressed. Suppresses cURL's globbing (wildcard matching) feature --globoff if the copied URL includes square bracket characters ([ or ]). (Starting in Firefox 76) Managing HAR dataP The HAR format enables you to export detailed information about network requests. In addition to the Copy and Save menu items for HAR in the context menu, similar menu items are available in the HAR dropdown menu in the toolbar, as well as an Import menuitem. ../../../_images/har-dropdown.png Network Monitor featuresP The following articles cover different aspects of using the network monitor: * Toolbar * Network request list * Network request details * Network traffic recording * Throttling * Inspecting web sockets * Inspecting server-sent events --------------------------------------------------------------------- Built with Sphinx using a theme provided by Read the Docs.