I've tried to clean up the code a bit using "using" type statements etc. If not, the client just reloads the document from the cache. 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. You can set a fixed expiry time too, though I’ve never done this – I can imaging it’s more maintenance overhead to ensure you always keep content ‘cached’ at various points http://mttags.com/iis-error/iis-error-code-302.php
Indeed, the spec I linked to does state that "If any of the entity tags match [that defined in If-None-Match] ... The code I'm using is from Jeff's post here (the page seems to have disappeared, see an archive copy at the Wayback Machine). 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 Tips if you want to buy a valuable Internet domain name. http://stackoverflow.com/questions/2603595/why-am-i-getting-304-not-modified-error-on-some-links-when-using-httpwebrequ
IIS returns a 304, even though the client doesn't yet have a copy of the resource. –Philippe Leybaert Apr 28 '10 at 13:05 @Philippe, have you found a solution This will greatly reduce resources on the server. Here's the code. Have a look at these: Configuring Output Caching in IIS7 Caching in IIS7 share|improve this answer edited Mar 1 '10 at 19:15 answered Mar 1 '10 at 18:24 squillman 33.3k868126
Standardisation of Time in a FTL Universe Past life of Satyabhama When is it okay to exceed the absolute maximum rating on a part? Why do central European nations use the color black as their national colors? http://www.grumpydev.com/ Steven Robbins There's a good SO thread on what the various browsers do with regard to cache headers when the user presses F5, CTRL+F5 etc: http://stackoverflow.com/questions/385367/what-requests-do-browsers-f5-and-ctrl-f5-refreshes-generate Terry Brown superb - Setting Up Expiry for Assets in IIS 7 In IIS manager left click on the website, folder or indeed file that you wish to set expiry on.
First up, a play with expiry of content. How to find positive things in a code review? How can I get a visa for India on a 2-day notice? http httpwebrequest http-status-code-304 if-modified-since share|improve this question edited Mar 20 '13 at 15:13 Mormegil 6,02512759 asked Apr 8 '10 at 21:30 Greg 11.6k52175347 possible duplicate of HttpWebRequest.GetResponse throws WebException
The real errors are 4xx (client error) and 5xx (server error). Proxy Started. Now you have to clean up after them by catching the exception every time you try to use If-Modified-Since. I didn't want to assume that the OP is just serving files out of vanilla IIS... –Dan Puzey Aug 23 '12 at 10:16 | show 3 more comments up vote 0
For example, if a user fills out a form, and submits it, a status code of 205 means the server is asking the browser to clear the form.206 - Partial ContentA http://stackoverflow.com/questions/2603595/why-am-i-getting-304-not-modified-error-on-some-links-when-using-httpwebrequ Here's the code. Why won’t you play ball? Reseller Affiliate Program Pricing Latest Updates Feedback Write a testimonial About Us Contact Us Follow Us on Twitter Facebook Server Time : 18-Oct-2016 21:33:35 GMT All Rights reserved © 100pulse.com Terms
http://brentmckendrick.com Brent McKendrick Thanks so much for this, great write up. the resource's modification date fails to match that supplied in an If-Modified-Since header field in the request" –Dan Puzey Aug 23 '12 at 10:14 @JustinHarvey: also, the reason for Fixing 304 errors - CheckUpDown You should never see this error at all for the CheckUpDown service. Check This Out Receive an HTTP data stream back from the Web server in response.
How to draw a horizontal rule with a colour gradient? The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields. As if there is some state not getting cleared or something in the code.
Our really simple guide to web hosting (getting your web site and email addresses on the Internet using your own domain name). asked 6 years ago viewed 68566 times active 1 year ago Blog Stack Overflow Podcast #91 - Can You Stump Nick Craver? Should I worry? It might be asking for a page, or sending data, but either way, that is called an HTTP Request.
It tells the client to use the new URL the next time it wants to fetch the same resource.302 - FoundA status code of 302 tells a client that the resource You will see one key bit in the code is where it seems to copy the http header settings from the browser request to it's request out to the site, and Building a model to help me determine parameters of a physical water filter? this contact form I have verified this by refreshing a page I am developing and seeing around 300 '304's in the browser, but only around 20 in Fiddler that actually go out to IIS.
How to check access permissions on items for a user? UPDATE HERE Still can't work this out. case "If-Modified-Since": request.IfModifiedSince = DateTime.Parse(listenerContext.Request.Headers[key]); break; I get the issue for example from http://en.wikipedia.org/wiki/Main_Page PS. Awesome.
case "If-Modified-Since": request.IfModifiedSince = DateTime.Parse(listenerContext.Request.Headers[key]); break; I get the issue for example from http://en.wikipedia.org/wiki/Main_Page PS. Are all melee attacks created equal? This may be, for example, because the client asked for the 800th-900th bytes of a document, but the document was only 200 bytes long.417 - Expectation FailedThe 417 status code means share|improve this answer answered Aug 23 '12 at 10:01 Dan Puzey 24.7k33580 1 had the same problem so here's an addition to this stackoverflow.com/questions/8294034/… –Asken Aug 23 '12 at 10:02
Only we can resolve them for you. If a client gets a 304 Not Modified, then it's the client's responsibility to display the resouce in question from its own cache.