Apache Server Error 304
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be returned if allowed by the client (e.g. your Web browser or our CheckUpDown robot). The client specifies this in the HTTP data stream sent
Http Error 304 Apache
to the Web server e.g. via If_Modified_Since headers in the request. Systems that apache error code 304 cache or index Web resources (such as search engines) often use the 304 response to determine if the information they apache 301 error previously gathered for a particular URL is now out-of-date. Fixing 304 errors - general You should never see this error in your Web browser. It should simply present the Web page from its
Apache 403 Error
cache - because it believes the page has not changed since it was last cached. If your client is not a Web browser, then it should equally be able to present the page from a cache. If unable to do so, it is not using the If_Modified_Since or related headers correctly. Fixing 304 errors - CheckUpDown You should never see this error at all for
Apache 404 Error
the CheckUpDown service. It indicates defective programming by us or the developers of the Web server software. Either we or they are not respecting HTTP protocols completely. The 304 status code should only be returned if we allow it in the HTTP data stream we send to the Web server. Because we keep no records of the actual content of your URL Web page, we specifically disallow the 304 response in the HTTP data stream we send. So if the Web server implements the HTTP protocol properly, it should never send an 304 status code back to us. This response is not what we expect, so we actively report it as an error even though it does not necessarily mean that the Web site is down. Please contact us directly (email preferred) whenever you encounter 304 errors. Only we can resolve them for you. Unfortunately this may take some time, because we have to analyse the underlying HTTP data streams and may have to liaise with your ISP and the vendor of the Web server software to agree the exact source of the error. 304 errors in the HTTP cycle Any client (e.g. your
response. 10.1 Informational 1xx This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by server error 302 an empty line. There are no required headers for this class of
304 Not Modified Error
status code. Since HTTP/1.0 did not define any 1xx status codes, servers MUST NOT send a 1xx response 304 not modified cache to an HTTP/1.0 client except under experimental conditions. A client MUST be prepared to accept one or more 1xx status responses prior to a regular response, even if the http://www.checkupdown.com/status/E304.html client does not expect a 100 (Continue) status message. Unexpected 1xx status responses MAY be ignored by a user agent. Proxies MUST forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself requested the generation of the 1xx response. (For example, if a proxy adds a "Expect: 100-continue" field when https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html it forwards a request, then it need not forward the corresponding 100 (Continue) response(s).) 10.1.1 100 Continue The client SHOULD continue with its request. This interim response is used to inform the client that the initial part of the request has been received and has not yet been rejected by the server. The client SHOULD continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The server MUST send a final response after the request has been completed. See section 8.2.3 for detailed discussion of the use and handling of this status code. 10.1.2 101 Switching Protocols The server understands and is willing to comply with the client's request, via the Upgrade message header field (section 14.42), for a change in the application protocol being used on this connection. The server will switch protocols to those defined by the response's Upgrade header field immediately after the empty line which terminates the 101 response. The protocol SHOULD be switched only when it is advantageous to do so. For example, switching
Content & Experience Progress Sitefinity Engage customers across digital channels at scale Software Quality Test Studio Release better quality software faster Individual Products http://www.telerik.com/blogs/understanding-http-304-responses DevTools Web UI for ASP.NET AJAX UI for ASP.NET MVC http://www.tek-tips.com/viewthread.cfm?qid=362965 UI for ASP.NET Core UI for PHP UI for JSP UI for Silverlight HTML5/JS Framework Kendo UI NativeScript Desktop UI for WPF UI for WinForms Mobile UI for NativeScript UI for Xamarin UI for UWP (Windows 10) UI for iOS UI for server error Android UI for Windows Universal UI for Windows Phone PRODUCTIVITY & QUALITY JustCode JustMock Testing Framework Debugging Fiddler JustDecompile JustTrace Reporting & Data Access Reporting Report Server Data Access DEPLOYMENT Modulus Mobile App Development Telerik Platform AppBuilder Analytics Backend Services Testing Test Studio Mobile Testing API Testing Digital Content 304 not modified & Experience Progress Sitefinity CMS Progress Sitefinity Digital Experience Cloud ENTERPRISE FREE TRIALS PRICING SUPPORT & LEARNING ABOUT US YOUR ACCOUNT Search Your Account Telerik Platform Blogs Telerik Blogs Understanding HTTP/304 Responses Understanding HTTP/304 Responses by Eric Lawrence November 05, 2012 .NET 0 Comments Users who are just getting started with Fiddler are often confused about the appearance of HTTP/304 responses in Fiddler’s Web Sessions list as webpages are loaded: A web server sends a HTTP/304 in response to a Conditional Validation request, indicating that the client’s copy of a resource is still valid and that the resource in question was Not Modified since the client cached its copy. Conditional validation enables clients to ensure that they have the latest resources without the performance overhead of the server re-sending all of its resources every time they are used. Identifying Conditional Requests A browser client sends a Conditional Validation request when it has a cac
Join INTELLIGENT WORK FORUMSFOR COMPUTER PROFESSIONALS Log In Come Join Us! Are you aComputer / IT professional?Join Tek-Tips Forums! Talk With Other Members Be Notified Of ResponsesTo Your Posts Keyword Search One-Click Access To YourFavorite Forums Automated SignaturesOn Your Posts Best Of All, It's Free! Join Us! *Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.Tek-Tips Posting Policies Jobs Jobs from Indeed What: Where: jobs by Link To This Forum! Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.Just copy and paste the BBCode HTML Markdown MediaWiki reStructuredText code below into your site. Apache: HTTP Server Forum at Tek-Tips HomeForumsMIS/ITWeb ServersApache: HTTP Server Forum Apache 304 reply number: what does it mean? thread65-362965 Forum Search FAQs Links MVPs Apache 304 reply number: what does it mean? Apache 304 reply number: what does it mean? SaltyDuke (Programmer) (OP) 19 Sep 02 05:13 howdy all,Just a quick question because my curiosity has gotten the better of me (again!):In Apache 2, what's a 304 reply? i know it means "not modified" or something, but what does THAT mean??!!thanx RE: Apache 304 reply number: what does it mean? wlwoman (TechnicalUser) 20 Sep 02 06:37 The 304 error is somewhat misleading. The Apache Webserver logs it as an error, but it's really this. Someone visits your site today, and tomorrow, they go back to your site. When they do, their local system connects with your server, and then the server tells the local machine that theinformation (html files, images, etc) are already in the cache of that users system, and the information is shown from the cache rather than the server itself. Apache logs this as the 30