Apache Http 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 to the Web server e.g. via If_Modified_Since headers apache error code 304 in the request. Systems that cache or index Web resources (such as search engines) apache 301 error often use the 304 response to determine if the information they previously gathered for a particular URL is now out-of-date. Fixing 304 apache 403 error errors - general You should never see this error in your Web browser. It should simply present the Web page from its cache - because it believes the page has not changed since it was last cached. apache 404 error 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 the CheckUpDown service. It indicates defective programming by us or the developers of the Web server software. Either we or they are not
Apache 302
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 Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server: Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is
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Http Error 412
the workings and policies of this site About Us Learn more about 304 not modified error Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions 304 not modified cache Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. http://www.checkupdown.com/status/E304.html Join them; it only takes a minute: Sign up Avoiding 304 (not modified) responses up vote 8 down vote favorite 1 Is it an ExpiresDefault Apache directive enough to avoid HTTP Status 304 responses from the server? I have set ExpiresDefault "access plus 10 years" but I'm still seeing log entries with a 304 response for "GET /assets/template/default/css/style.min.css?v=1 http://stackoverflow.com/questions/22383125/avoiding-304-not-modified-responses HTTP/1.1" whenever I open any page on a local PHPMyFAQ site. Emptying the browser cache doesn't seem to change anything. apache http http-status-codes http-status-code-304 share|improve this question asked Mar 13 '14 at 15:19 That Brazilian Guy 91821233 add a comment| 1 Answer 1 active oldest votes up vote 11 down vote accepted The Expires: header your server sends out has nothing to do with future 304 responses. It provides only an estimate to clients/proxies for how long they can wait before considering a resource "stale." Clients aren't required to observe this header and are free to continue making new requests for the same resource if they wish. So, to answer your question in short: No, you'll never be able to explicitly prevent users from making new requests for the same resource regardless of what headers you send. The 304 response is the result of a matching If-Match or If-Modified-Since header in the client request. What's happening here is your server is sending out either/or/both of the following headers with its original response: ETag Last-M
is sent in response to a request (for a document) that asked for the document only if it http://100pulse.com/http-statuscode/304.jsp was newer than the one the client already had. Normally, when a https://www.addedbytes.com/articles/for-beginners/http-status-codes/ document is cached, the date it was cached is stored. The next time the document is viewed, the client asks the server if the document has changed. If not, the client just reloads the document from the cache. Why it Occurs The HTTP status code 304 Not http error Modified occurs if the client has performed a conditional GET request and access is allowed, but the document has not been modified. The server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields. Fixing 304 Error Code You should 304 not modified never see this error in your Web browser. It should simply present the Web page from its 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. If you monitor your website through 100 pulse, we will intimate you through mail or short message service whenever you encounter 304 status code. Features Website Monitoring Monitor DNS Server Mail Server Monitoring Mysql Server Monitoring FTP Monitoring Port Monitoring Alerts & Reports Instant Notification Web Server Monitoring Report Public Report Template Free Uptime Button Monitoring Tools Webpage Availability Checker Port checker DNS Checker IP Finder Server location Finder and more... Reseller Affiliate Program Pricing Latest Updates Feedback Write a testimonial About Us Contact Us Follow Us on Twitter Facebook Server Time : 30-Sep-2016 22:49:06 GMT All Rights reserved © 100pulse.com Terms | Privacy | Sitemap
Articles Code Recommended Most Popular HTTP Status Codes for Beginners All valid HTTP 1.1 Status Codes simply explained. HTTP, Hypertext Transfer Protocol, is the method by which clients (i.e. you) and servers communicate. When someone clicks a link, types in a URL or submits out a form, their browser sends a request to a server for information. It might be asking for a page, or sending data, but either way, that is called an HTTP Request. When a server receives that request, it sends back an HTTP Response, with information for the client. Usually, this is invisible, though I'm sure you've seen one of the very common Response codes - 404, indicating a page was not found. There are a fair few more status codes sent by servers, and the following is a list of the current ones in HTTP 1.1, along with an explanation of their meanings. A more technical breakdown of HTTP 1.1 status codes and their meanings is available at http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html. There are several versions of HTTP, but currently HTTP 1.1 is the most widely used. Informational 100 - ContinueA status code of 100 indicates that (usually the first) part of a request has been received without any problems, and that the rest of the request should now be sent.101 - Switching ProtocolsHTTP 1.1 is just one type of protocol for transferring data on the web, and a status code of 101 indicates that the server is changing to the protocol it defines in the "Upgrade" header it returns to the client. For example, when requesting a page, a browser might receive a statis code of 101, followed by an "Upgrade" header showing that the server is changing to a different version of HTTP. Successful 200 - OKThe 200 status code is by far the most common returned. It means, simply, that the request was received and understood and is being processed.201 - CreatedA 201 status code indicates that a request was successful and as a result, a resource has been created (for example a new page).202 - AcceptedThe status code 202 indicates that server has received and understood the request, and that it has been accepted for processing, although it may