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  • cache problem in asp.net

    - by JoelFan
    I'm seeing an issue of some static pages that are using the browser cache, which is not desired. To prevent caching, I'm setting <clientCache cacheControlMode="DisableCache" /> in the relevant <location> tag in web.config If I open the page in Firebug (in the Net tab), I see that the Response headers have Cache-Control: no-cache which is correct, but the status of the Response is 304 Not Modified! Isn't that a contradiction? How can I get it to stop caching (i.e. always send a 200 with content)?

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  • DNS queries to compromise DNS cache [on hold]

    - by Chris
    The transaction ID for DNS queries can take values from 1 to 65,536 and my computer pseudorandomly chooses one for each DNS request. If I sents 1,024 false replies per request, how many requests should I trigger to compromise the DNS cache with probability 99%? or as close tot hat as I can get. Thanks I'm getting a result of .6 requests which doesn't seem right to me. Feel as though it should be around 30

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  • Using SSD as disk cache

    - by casualcoder
    Is there software for Linux to use an SSD as disk cache? I believe that Sun does something like this with ZFS, though not sure. A quick search provides nothing suitable. The goal would be to put frequently requested files on the SSD on-the-fly. Since the SSD has more capacity than RAM for less money and better performance than hard disk, this should provide an efficient performance boost.

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  • Remove deleted posts from central google reader cache

    - by bogdanbrudiu
    After posting some test blog entries, I then remove them from my blog. however, once loaded by google reader, they never disappear from it. Even if I sign up to my blog feed from a different account, they still appear, so it seems that they are centrally cached by google reader. How can I force google reader to delete them from cache?

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  • Header precendence: Apache Vs. PHP specific to cache-control & expires

    - by David
    My companies production dynamic web servers ( Apache + PHP 5.1x) are using the Apache expires module and there is a clause inside http.conf as follows: <FilesMatch ".+"> ExpiresActive On ExpiresDefault "A0" </FilesMatch> If I were to set inside a php script "Cache-Control" and "Expires", would it get eaten by this clause? Normally I would test this on my own but having trouble convincing the Expires module to function on my workstation and the company Admin's are down at the data-center.

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  • Clearing cmd.exe memory or cache

    - by Abs
    The main question is how do I clear the command prompts memory or cache. I ran this on cmd.exe svn info <URL> Which prompted me a for a username and password which I entered. I then logged off and logged back in immediately and I entered that same command and I wasn't asked for a username and password. I want to clear this to test something without restarting my server! How can I do this?

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  • Varnish send while cache

    - by osmano807
    I wanted the varnish download the file to the cache while sends to client. From what I am seeing, it first download and then send the file, and that with very large files, is slow. (sorry for english, I'm using an online translator.)

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  • MySQL query cache is enabled but not being used

    - by Yoga
    I've checked the query cache is enabled mysql> SHOW VARIABLES LIKE 'have_query_cache'; +------------------+-------+ | Variable_name | Value | +------------------+-------+ | have_query_cache | YES | +------------------+-------+ 1 row in set (0.00 sec) But seems it is not being used mysql> SHOW STATUS LIKE 'Qcache%'; +-------------------------+----------+ | Variable_name | Value | +-------------------------+----------+ | Qcache_free_blocks | 1 | | Qcache_free_memory | 16759648 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 21555882 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | +-------------------------+----------+ 8 rows in set (0.00 sec) Any reason?

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  • Safe to disable compile options for Nginx (when used only as reverse proxy/cache)

    - by Alex
    I have read that I can do this to make a smaller footprint Nginx when used as static content cache/reverse proxy: --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module What other options are safe to disable? SSI, FastCGI? Others? The only requirements for the reverse proxy is to be able to do https and gzip compression. Will disabling all the module really help with footprint and/or performance?

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  • NGINX Cache Viewstate and Cookies

    - by user42833
    We are running NGINX 7.65 on a Ubuntu 10 server. NGINX is setup as a reverse proxy to an IIS website where the viewstate is passed through the headers. We want to set up the cache feature in NGINX but need to make sure it does not mess up the viewstate and cookies associated with each individual customer. Will adding this to the nginx.conf file fix this - proxy_pass_header Header or is there more that would need to be done? Thanks,

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  • About memory cache of Linux

    - by cheneydeng
    I'm running a python script to do some statistics and the actually memory which used is low,about 10%.And no other process cost more memory.However,when i use free -m and it shows that almost 95% memory has been used.The point is that my script should do a lot of read from files,so i wonder if there's any mechanism of Linux memory cache that caused the problem?echo 1 >> /proc/sys/vm/drop_caches works,but it seems manually.How can i reduce the memory cost and doesn't make a bad effect on reading files?

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  • Client Web Browser Behavior When Handling 301 Redirect

    - by Jon Swanson
    The RFC seems to suggest that the client should permanently cache the response: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html 10.3.2 301 Moved Permanently The requested resource has been assigned a new permanent URI and any future references to this resource SHOULD use one of the returned URIs. Clients with link editing capabilities ought to automatically re-link references to the Request-URI to one or more of the new references returned by the server, where possible. This response is cacheable unless indicated otherwise. The new permanent URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s). If the 301 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued. Note: When automatically redirecting a POST request after receiving a 301 status code, some existing HTTP/1.0 user agents will erroneously change it into a GET request. I'm having a hard time finding concrete browser documentation for any major browser that states how they handle these. I've started digging through the source code of firefox, but quickly got lost. Is the following scenario true for which (if any) browsers, and is there definitive documentation for either Firefox or IE that states as much?: First Time Around: 1.1: User enters link to site A, or clicks on a link directed at Site A 1.2: Browser interprets link at Site A, first time, no cache. Sends GET to Site A. 1.2: Site A responds with 301 Redirect to Site B 1.3: Browser sends GET to Site B. Any Subsequent Times Around: 2.2: User clicks on a link directed at Site A 2.2: Browser sees that, due to a past 301 redirect, Site A should now be Site B. 2.3: Without initiating any request whatsoever at Site A, browser initiates GET at Site B.

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  • Browser window popups - risks and special features

    - by Sandeepan Nath
    1. What exactly is the security risk with popups? The new browsers provide settings to block window popups (on blocking, sites with active popups display a message to user). What exactly is the security risk with popups? If allowing popups can execute something dangerous, then the main window can too. Is it not the case. I think I don't know about some special powers of window popups. 2. Any special features of popup windows? Take for example the HDFC bank netbanking site. The entire netbanking session happens in a new window popup and a user neither manually edit the URL or paste the URL in the main browser window. it does not work. Is a popup window needed for this feature? Does it improve security? (Asking because everything that is there in this site revolves around security - so they must have done that for a reason too). Why otherwise they would implement the entire netbanking on a popup window? 3. Is it possible to override browser's popup blocking settings Lastly, the HDFC site succcessfully displays popup window even when in the browser settings popups are blocked. So, how do they do it? Is that a browser hack? To see this - go to http://hdfcbank.com/ Under the "Login to your account" section select "HDFC Bank NetBanking" and click the "Login" button. You can verify that even if popups are blocked/popup blocker is enabled in the browser settings, this site is able to display popups. The answers to this question say that it is not possible to display popup windows if it has been blocked in browser settings. Solved Concluded with Pointy's solution and comments under that. Here is a fiddle demonstrating the same.

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  • Add a “Textmate Style” Lightweight Text Editor with Dropbox Syncing to Chrome and Iron

    - by Asian Angel
    Are you looking for a good text editing environment with Dropbox syncing built in for your browser? If the answer is yes, then you should definitely give the SourceKit – Text Editor Inside Chrome web app a try. Once SourceKit has finished installing you will need to log into your Dropbox account if you have not already done so. Note: Dropbox login tab will automatically open for your convenience. When the login process is complete you will need to authorize access for SourceKit to sync up with your account. After you authorize access you can switch back to the SourceKit tab and see a complete listing of your Dropbox files available on the left side. Note: Sidebar width is adjustable. Just choose a file to start editing it as desired. You can modify how the interface looks and acts using the controls at the top of the editing window. The tab bar UI also lets you work on multiple documents at the same time. Note: The .crx install file is 5.2 MB in size and SourceKit will take a few moments to get settled in once the file is downloaded. SourceKit – Text Editor Inside Chrome [Chrome Web Store] Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Add a “Textmate Style” Lightweight Text Editor with Dropbox Syncing to Chrome and Iron Is the Forcefield Really On or Not? [Star Wars Parody Video] Google Updates Picasa Web Albums; Emphasis on Sharing and Showcasing Uwall.tv Turns YouTube into a Video Jukebox Early Morning Sunrise at the Beach Wallpaper Data Networks Visualized via Light Paintings [Video]

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  • First Stable Version of Opera 15 has been Released

    - by Akemi Iwaya
    Opera has just released the first stable version of their revamped browser and will be proceeding at a rapid pace going forward. There is also news concerning the three development streams they will maintain along with news of an update for the older 12.x series for those who are not ready to update to 15.x just yet. The day is full of good news for Opera users whether they have already switched to the new Blink/Webkit Engine version or are still using the older Presto Engine version. First, news of the new development streams… Opera has released details outlining their three new release streams: Opera (Stable) – Released every couple of weeks, this is the most solid version, ready for mission-critical daily use. Opera Next – Updated more frequently than Stable, this is the feature-complete candidate for the Stable version. While it should be ready for daily use, you can expect some bugs there. Opera Developer – A bleeding edge version, you can expect a lot of fancy stuff there; however, some nasty bugs might also appear from time to time. From the Opera Desktop Team blog post: When you install Opera from a particular stream, your installation will stick to it, so Opera Stable will be always updated to Opera Stable, Opera Next to Opera Next and so on. You can choose for yourself which stream is the best for you. You can even follow a couple of them at the same time! Of particular interest is the announcement of continued development for the 12.x series. A new version (12.16) is due to be released soon to help keep the older series up to date and secure while the transition process from 12.x to 15.x continues.    

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  • How should you approach supporting rapidly-updating web browsers?

    - by Schnapple
    Today, Firefox 5 was released. If all goes according to plan, Firefox 7 will be out by the end of the year. Firefox has adopted the Google Chrome development model wherein version numbers are largely unimportant and so just supporting "the latest (publicly available) one" is probably the best strategy. But how do you best test that? As my QA guys have pointed out, if you tell the client that you support "the latest version" but a version comes out that breaks your site, then you have a problem because now you've stated you support a web browser you don't. And since both Firefox and Chrome now update themselves automatically, the average person probably has no clue or care what version they're running. And having them either not upgrade or roll back is nontrivial. I'm finding there are a number of organizations that mandate their employees use IE (the head of IT subscribes to the Microsoft school of thought), or mandate their employees use Firefox (the head of IT subscribes to the IE-is-insecure school of thought), so Chrome updating constantly was a non-issue. But now that Firefox is a member of that club, I can see this becoming a bigger issue soon. My guess, in the case of Firefox, would be that the Aurora channel is the key, but what is the best way to approach testing it? Should we fix anything that comes up as an issue in Aurora, or should we wait until closer to the scheduled release? Do people automate this sort of thing?

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  • Node.js MMO - process and/or map division

    - by Gipsy King
    I am in the phase of designing a mmo browser based game (certainly not massive, but all connected players are in the same universe), and I am struggling with finding a good solution to the problem of distributing players across processes. I'm using node.js with socket.io. I have read this helpful article, but I would like some advice since I am also concerned with different processes. Solution 1: Tie a process to a map location (like a map-cell), connect players to the process corresponding to their location. When a player performs an action, transmit it to all other players in this process. When a player moves away, he will eventually have to connect to another process (automatically). Pros: Easier to implement Cons: Must divide map into zones Player reconnection when moving into a different zone is probably annoying If one zone/process is always busy (has players in it), it doesn't really load-balance, unless I split the zone which may not be always viable There shouldn't be any visible borders Solution 1b: Same as 1, but connect processes of bordering cells, so that players on the other side of the border are visible and such. Maybe even let them interact. Solution 2: Spawn processes on demand, unrelated to a location. Have one special process to keep track of all connected player handles, their location, and the process they're connected to. Then when a player performs an action, the process finds all other nearby players (from the special player-process-location tracking node), and instructs their matching processes to relay the action. Pros: Easy load balancing: spawn more processes Avoids player reconnecting / borders between zones Cons: Harder to implement and test Additional steps of finding players, and relaying event/action to another process If the player-location-process tracking process fails, all other fail too I would like to hear if I'm missing something, or completely off track.

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  • Click No Browse: How to Navigate Objects Without Opening Them

    - by thatjeffsmith
    Oracle SQL Developer by default automatically opens the object editor when you click on an object in your connection tree or schema browser. For most folks this is very convenient. But if you are selecting objects to drag them to a model or to the worksheet, this can get annoying as the focus of the screen changes when you don’t want it to. The other scenario this feature might disrupt more than delight is when you want to click around the database in the tree and every time you click on an object, the object editor automatically changes to the selected object. You can disable this automatic browsing behavior in SQL Developer by modifying this preference: Tools Preferences Database ObjectViewer Open Object on Single Click Disable this if you don’t want an object to open when you click on it OK, I do realize my description of the problem may have confused the heck out of you just now. So instead of more words, how about a couple of animations of the object-click behavior with the option ON and OFF? Preference Disabled Click, no open. Double click, open. Preference Enabled (Default) As you click on objects, they are automatically opened

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  • Does IE have more strict Javascript parsing than Chrome?

    - by Clay Shannon
    This is not meant to start a religio-technical browser war - I still prefer Chrome, at least for now, but: Because of a perhaps Chrome-related problem with my web page (see https://code.google.com/p/chromium/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified&groupby=&sort=&id=161473), I temporarily switched to IE (10) to see if it would also view the time value as invalid. However, I didn't even get to that point - IE stopped me in my tracks before I could get there; but I found that IE was right - it is more particular/precise in validating my code. For example, I got this from IE: SCRIPT5007: The value of the property '$' is null or undefined, not a Function object ...which was referring to this: <script src="/CommonLogin/Scripts/jquery-1.9.1.min.js" type="text/javascript"></script> <script type="text/javascript"> // body sometimes becomes white???? with jquery 1.6.1 $("body").css("background-color", "#405DA7"); < This line is highlighted as the culprit: $("body").css("background-color", "#405DA7"); jQuery is referenced right above it - so why did it consider "$" to be undefined, especially when Chrome had no problem with it...ah! I looked at that location (/CommonLogin/Scripts/) and saw that, sure enough, the version of jQuery there was actually jquery-1.6.2.min.js. I added the updated jQuery file (1.9.1) and it got past this. So now the question is: why does Chrome ignore this? Does it download the referenced version from its own CDN if it can't find it in the place you specify? IE did flag other errs after that, too; so I'm thinking perhaps IE is better at catching lurking problems than, at least, Chrome is. Haven't tested Firefox diesbzg yet.

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  • Rendering a DOM across multiple displays

    - by meetamit
    I'm building a data-driven animation with HTML and javascript to run in a web browser. I would like to display it tiled across three 1080p monitors. This essentially yields a viewport that's 5760px wide and 1080px tall. Pretty large. Does anyone have experience setting up something like this? I have many questions below, but any tip would be appreciated: Is it reasonable to expect a DOM to render into such a large viewport size at close to 60fps? I might choose to use canvas, instead of SVG or HTML, but that would yield a giant canvas. Can a canvas with such high resolution be performant? Of course everything depends on the complexity of the graphics I want to render, but I'm looking to remove that factor from this question, so assume I'm asking about a canvas animation that can run at 60fps at 1920x1080 resolution. Would it run roughly as fast at 3 times the width? Would three.js and WebGL be a more proper approach at that resolution? How do you actually cause Chrome or FF to span 3 monitors at full screen? Do I need a 3rd party solution of any kind? Thanks!

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  • Lots of Internet browsing issues, all browsers

    - by dario_ramos
    Before the upgrade, everything was working fine. Now, however, I can connect to the Internet but a lot of stuff fails, and the weirdest thing is that it happens with Firefox, Chromium and Opera. Some of the things that fail: I can't log in to Stack Overflow, after entering user/pass it loads for a long time on Firefox and throws Error 408 (browser request timed out) on Chromium and Opera I can't log in to Hotmail, similar symptoms I can login to Facebook, but when I try to write a comment, or just post something in my wall, it stays loading for a long time, and then fails The first two issues seem to be related to secure pages, and the second one is another issue altogether, I believe. However, they all happen with all browsers, which is really weird. Talking about weird: I connect using a Huawei SmartAX MT 810 USB modem, which cost me blood and tears to get it working under Ubuntu. I ordered an ethernet modem/router with my ISP, and I'm still waiting, but this issue intrigues me anyway. Has anyone experienced this kind of problems? I Googled around, but couldn't find a similar case.

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