Comet Donati, or Donati's Comet, formally designated C/1858 L1 and 1858 VI, is a long-period comet named after the Italian astronomer Giovanni Battista Donati who first observed it on June 2, 1858. After the Great Comet of 1811, it was the most brilliant comet that appeared in the 19th century.It was also the first comet to be photographed. I equated comet to yahoo. The curated lists and indexes, what sounds like the portal concept, and news sounds like yahoo. Rover sounds like Google but is likely a forebear, Alta Vista or Lycos were the names I could come up with from that time. 1 point 2 years ago. Download the latest version of CometBird for Windows. Light and compact web browser. CometBird is suspiciously similar to the fourth version of Mozilla Firefox. CometBird is a powerful and fast web browser. The outstanding CometBird Web browser is secure, speedy, and totally free; its specially designed features will change the way you use the Web. The upgraded version is even more effective in both performance and privacy protection.
The use of Comet techniques in web development predates the use of the word Comet as a neologism for the collective techniques. Comet is known by several other names, includingAjax Push,Reverse Ajax,Two-way-web,HTTP Streaming, andHTTP server pushamong others. The term Comet is not an acronym, but was coined by Alex Russell in his 2006 blog post Comet: Low Latency Data for the Browser.
In recent years, the standardisation and widespread support of WebSocket and Server-sent events has rendered the Comet model obsolete.
The ability to embed Java applets into browsers (starting with Netscape Navigator 2.0 in March 1996) made two-way sustained communications possible, using a raw TCP socket to communicate between the browser and the server. This socket can remain open as long as the browser is at the document hosting the applet. Event notifications can be sent in any format – text or binary – and decoded by the applet.
The very first application using browser-to-browser communications was Tango Interactive,[failed verification] implemented in 1996–98 at the Northeast Parallel Architectures Center (NPAC) at Syracuse University using DARPA funding. TANGO architecture has been patented by Syracuse University. TANGO framework has been extensively used as a distance education tool. The framework has been commercialized by CollabWorx and used in a dozen or so Command&Control and Training applications in the United States Department of Defense.
In April 2001, Chip Morningstar began developing a Java-based (J2SE) web server which used two HTTP sockets to keep open two communications channels between the custom HTTP server he designed and a client designed by Douglas Crockford; a functioning demo system existed as of June 2001. The server and client used a messaging format that the founders of State Software, Inc. assented to coin as JSON following Crockford's suggestion. The entire system, the client libraries, the messaging format known as JSON and the server, became the State Application Framework, parts of which were sold and used by Sun Microsystems, Amazon.com, EDS and Volkswagen.
In March 2006, software engineer Alex Russell coined the term Comet in a post on his personal blog. The new term was a play on Ajax (Ajax and Comet both being common household cleaners in the USA).
Comet applications attempt to eliminate the limitations of the page-by-page web model and traditional polling by offering two-way sustained interaction, using a persistent or long-lasting HTTP connection between the server and the client. Since browsers and proxies are not designed with server events in mind, several techniques to achieve this have been developed, each with different benefits and drawbacks. The biggest hurdle is the HTTP 1.1 specification, which states 'this specification.. encourages clients to be conservative when opening multiple connections'. Therefore, holding one connection open for real-time events has a negative impact on browser usability: the browser may be blocked from sending a new request while waiting for the results of a previous request, e.g., a series of images. This can be worked around by creating a distinct hostname for real-time information, which is an alias for the same physical server. This strategy is an application of domain sharding.
Specific methods of implementing Comet fall into two major categories: streaming and long polling.
An application using streaming Comet opens a single persistent connection from the client browser to the server for all Comet events. These events are incrementally handled and interpreted on the client side every time the server sends a new event, with neither side closing the connection.
Specific techniques for accomplishing streaming Comet include the following:
A basic technique for dynamic web application is to use a hidden iframe HTML element (an inline frame, which allows a website to embed one HTML document inside another). This invisible iframe is sent as a chunked block, which implicitly declares it as infinitely long (sometimes called 'forever frame'). As events occur, the iframe is gradually filled with
script tag is executed as it is received. Some browsers require a specific minimum document size before parsing and execution is started, which can be obtained by initially sending 1–2 kB of padding spaces.
One benefit of the iframes method is that it works in every common browser. Two downsides of this technique are the lack of a reliable error handling method, and the impossibility of tracking the state of the request calling process.
onreadystatechange callback each time it receives new data.
None of the above streaming transports work across all modern browsers without negative side-effects. This forces Comet developers to implement several complex streaming transports, switching between them depending on the browser. Consequently, many Comet applications use long polling, which is easier to implement on the browser side, and works, at minimum, in every browser that supports XHR. As the name suggests, long polling requires the client to poll the server for an event (or set of events). The browser makes an Ajax-style request to the server, which is kept open until the server has new data to send to the browser, which is sent to the browser in a complete response. The browser initiates a new long polling request in order to obtain subsequent events. IETF RFC 6202 'Known Issues and Best Practices for the Use of Long Polling and Streaming in Bidirectional HTTP' compares long polling and HTTP streaming.Specific technologies for accomplishing long-polling include the following:
While any Comet transport can be made to work across subdomains, none of the above transports can be used across different second-level domains (SLDs), due to browser security policies designed to prevent cross-site scripting attacks. That is, if the main web page is served from one SLD, and the Comet server is located at another SLD (which does not have cross-origin resource sharing enabled), Comet events cannot be used to modify the HTML and DOM of the main page, using those transports. This problem can be sidestepped by creating a proxy server in front of one or both sources, making them appear to originate from the same domain. However, this is often undesirable for complexity or performance reasons.
Unlike iframes or XMLHttpRequest objects,
A long-polling Comet transport can be created by dynamically creating
Browser-native technologies are inherent in the term Comet. Attempts to improve non-polling HTTP communication have come from multiple sides:
EventSourceand a new MIME type
text/event-stream. All major browsers except Microsoft Internet Explorer include this technology.
This API has been deprecated.
The process known as BitComet Resource Browser belongs to software unknown by www.BitComet.com.
Description:CometBrowser.exe is not essential for the Windows OS and causes relatively few problems. CometBrowser.exe is located in a subfolder of 'C:Program Files'.Known file sizes on Windows 10/8/7/XP are 363,832 bytes (75% of all occurrences) or 478,520 bytes.
The program has no visible window. It is a Verisign signed file. CometBrowser.exe is digitally signed. CometBrowser.exe is not a Windows core file. The process listens for or sends data on open ports to a LAN or the Internet.CometBrowser.exe is able to record keyboard and mouse inputs.Therefore the technical security rating is 35% dangerous.
Recommended: Identify CometBrowser.exe related errors
Important: Some malware camouflages itself as CometBrowser.exe, particularly when located in the C:Windows or C:WindowsSystem32 folder. Therefore, you should check the CometBrowser.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.