How far back do we go? Way back in 2001, a debugger called “Venkman” was available for Netscape Navigator version 7. Plus, Developer Edition comes with a slick new theme that matches its tools. Thankfully, Developer Edition makes this easy by letting you run both programs side by side. Of course, testing your websites in the standard Firefox release is still crucial. It gets new feature updates more quickly so that you can use the latest tools. That’s one of the reasons Mozilla released Firefox Developer Edition in November 2014 as the recommended Firefox browser for developers. Between the time a useful tool first appears in an experimental nightly build and the time it’s available for everyone to use in Firefox, a while has passed. Developing and testing new browser features, however, takes time. If you do any kind of development for the web, then you know how important tools are, and you like finding tools that make your life easier. Patrick Brosset explores how this browser can be used to keep updated about the latest tools for CSS features and animations, testing website displays and some tips and tricks for developers and designers. On first inspection the only notable difference is that it doesn’t support request tagging and the Access-Control-Expose-Headers response header.A walk through some of the main tools and differential features of Firefox Developer Edition. Tip: How to simulate a cross-domain request if you have just a single HTTP server to play with: Create a host alias of your web server and reload the requesting page using the alias URL.įinally, today I learned that the Jetty 7 web server has a CORS filter implementation similar to the one I developed few months ago. The server may also include optional CORS response headers, such as Access-Control-Allow-Credentials (to tell the browser that it accepts cookies) or Access-Control-Expose-Headers (to tell the browser which custom headers are safe to expose to the requesting script).ĬORS also has the so-called preflight request which browsers can send using HTTP OPTIONS prior to the actual CORS request to query the CORS settings of a particular HTTP server, such as the supported HTTP methods, custom headers, etc. If the server allowed the origin it replies with an Access-Control-Allow-Origin header that contains a verbatim copy of the Origin header value or * (meaning any origin). The server checks the Origin value and responds accordingly, by either allowing or denying the request. Note the Origin header which the browser inserted to identify the domain from which the HTML page originated. How to load the Firebug Network Monitorįor a simple/actual CORS request Firebug will then display the following headers: Simple/actual CORS request Click on the “Net” tab and then on the “XHR” tab, then launch your cross-domain request. To observe a CORS request in action you need a relatively recent version of Firebug (e.g. This is great for understanding how the protocol works, particularly the behaviour of simple/actual vs. It provides a generic servlet filter which can be retrofitted to any existing Java web app to make it cross-domain XHR capable.įirebug has an excellent network activity monitor which can be used to reveal the CORS-specific conversation between browser and server during a cross-domain XHR. Later I span off the server-side CORS code into a project on its own, called CORS Filter. Json2Ldap turned out to be an excellent case for CORS as the web service had to be capable of serving cross-domain requests. My first encounter with CORS was during the development of Json2Ldap, a smart piece of software designed to turn one or more LDAP directories into a web friendly JSON-RPC service. As of 2010 most browsers such as FF, IE, Chrome and Safari support it. ![]() The goal is to make CORS an official W3C standard. The acronym CORS stands for Cross-Origin Resource Sharing and was developed by a group of web activists to address the issue of making browser cross-domain requests in a standards-compliant way. Firebug, the indispensable Firefox add-on for serious developers, is great for debugging web apps that make use of the new CORS mechanism for cross-domain requests.
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