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  • Why are my DNS Lookups so long (300+ms) when accessing my web site?

    - by Travis
    I'm running a Fedora 11 server with Apache 2. I'm trying to optimize so things are as fast as possible from the server side, and I'm noticing (via Firebug for Firefox) that upon loading the homepage of one of the sites on the web server that for every file it loads (HTML, CSS, JavaScript, GIF, PNG, JPG, etc.), it does a DNS lookup. All of the files it is looking up are local to the server, so I'm surprised to see it even do a DNS lookup. Also, each of these lookups is in the 150-450ms range, which is way too high for my liking. I've tried adjusting /etc/resolve.conf to use Google's Public DNS servers. I restarted the network service and tapped the page again, but the numbers didn't go down. I've reverted back to the default DNS servers since I didn't see any gain. Any ideas on what is causing it to: a) do the dns lookup in the first place, and b) take so long when doing the actual lookup? Thanks in advance.

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  • How can I force the server socket to re-accept a request from a client?

    - by Roman
    For those who does not want to read a long question here is a short version: A server has an opened socket for a client. The server gets a request to open a socket from the same client-IP and client-port. I want to fore the server not to refuse such a request but to close the old socket and open a new one. How can I do ti? And here is a long (original) question: I have the following situation. There is an established connection between a server and client. Then an external software (Bonjour) says to my client the it does not see the server in the local network. Well, client does nothing about that because of the following reasons: If Bonjour does not see the server it does not necessarily means that client cannot see the server. Even if the client trusts the Bonjour and close the socket it does not improve the situation ("to have no open socket" is worser that "to have a potentially bad socket"). So, client do nothing if server becomes invisible to Bonjour. But than the server re-appears in the Bonjour and Bonjour notify the client about that. In this situation the following situations are possible: The server reappears on a new IP address. So, the client needs to open a new socket to be able to communicate with the server. The server reappears on the old IP address. In this case we have two subcases: 2.1. The server was restarted (switched off and then switched on). So, it does not remember the old socket (which is still used by the client). So, client needs to close the old socket and open a new one (on the same server-IP address and the same server-port). 2.2. We had a temporal network problem and the server was running the whole time. So, the old socket is still available for the use. In this case the client does not really need to close the old socket and reopen a new one. But to simplify my life I decide to close and reopen the socket on the client side in any case (in spite on the fact that it is not really needed in the last described situation). But I can have problems with that solution. If I close the socket on the client side and than try to reopen a socket from the same client-IP and client-port, server will not accept the call for a new socket. The server will think that such a socket already exists. Can I write the server in such a way, that it does not refuse such calls. For example, if it (the server) sees that a client send a request for a socket from the same client-IP and client-port, it (server) close the available socket, associated with this client-IP and client-port and than it reopens a new socket.

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  • Is there a way to bypass the jQuery error handler?

    - by oravecz
    If my Ajax call returns a successful result, but while processing the result I cause an exception, the error handler fires. This seems counter intuitive to me as I think the error handler should only fire when an error occurs as a result of making the Ajax call or via a server-side error. I am trying to use the Ajax function in a unit test so I would like to tell the difference between the two different failure scenarios.

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  • regular expression for challenge value

    - by Salman
    Hi what will be the regular expression to extract challenge var value i am interested in this vlaue 03AHJ_Vut9LJLOJuCsjF9PbSSMncTyUe7Y4dHX11eRLae3LGfDZ0hSfDR7jZq2ZrKJxyC-LRSSppv72oHKaQMsd-EnoVNL6p7liTh7siN26zzTA_E2rcC_JQ15613Azz4qm8HjPtAyksUdc7QZydszwolk92hBPrAAig this value changes every time we refresh it so the expression has to be generic enough to pick up what ever is the value var RecaptchaState = { site : '6LeKCL8SAAAAADV5Dr-lfY2eOEV8rubeN25BAKp2', challenge : '03AHJ_Vut9LJLOJuCsjF9PbSSMncTyUe7Y4dHX11eRLae3LGfDZ0hSfDR7jZq2ZrKJxyC-LRSSppv72oHKaQMsd-EnoVNL6p7liTh7siN26zzTA_E2rcC_JQ15613Azz4qm8HjPtAyksUdc7QZydszwolk92hBPrAAig', is_incorrect : false, programming_error : '', error_message : '', server : 'http://www.google.com/recaptcha/api/', timeout : 18000}; any help will be appreciated, or any method to extract this value in any server side lang

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  • JQuery: Floating share box like Mashable?

    - by Prashant
    I am looking for a jQuery plugin which can serve me the floating share box functionality just like mashable implement in their new design: http://mashable.com/2010/03/12/flickr-co-founders-startup-hunch-raises-10-million/. On the page above in the left side mashable has sharing options which stays on the screen when you scroll the page. I want to implement same kind of functionality in my application, using a jQuery plugin.

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  • Is it is possible to create cheque deposit( Remote Deposit Capture) in iphone

    - by iPhoneDev
    Hi, In recent months there has been an increased interest in offering a mobile (remote) deposit capture solution. I am also thing to create the same Free app, but dont know the flow. I can capture cheque image and can send it to server, then the server side team will handle rest of operation. If any one can help me to get the technical flow, where I can understand how to achieve this on iPhone. (Any example similar to this would be great) Thanks

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  • How to repair a Veritas tape that has been overwritten a bit?

    - by Ismo Utriainen
    I meant to restore some files, but I forgot that there was a monday backup job just waiting for tape loading. So veritas 10d started to write over my tape and that valuable data is now gone. The original data size was about 40 GB and that accidentally started job wrote about 30 MB to the begin of tape. What are my possibilities to recover some data from that tape? Update: Inventory and catalog doesn't help, media settings are overwrite, not append. It is a DLT drive.

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  • Crackers - How do they do it, how do we fight back?

    - by zedo
    As someone who is interested in learning more about the security side of technology, I ask you all the following questions: How is it that crackers crack software? What techniques are used to do so? I would imagine that the cracking methods depend upon the language the software is written in, right? Aside from using something like cloud-based security for SaaS ((software as a service) which isn't always an option), what choices does one have to prevent their software from being compromised?

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  • What's the simplest way to make a scrollable list of controls with labels?

    - by Jon Cage
    Using C++/CLI and Windows Forms, I'm trying to make a simple scrollable list of labelled text controls as a way of displaying some data fields. I'm having trouble making a TableLayoutPanel scrollable - every combination of properties I've tried seems to result in some really peculiar side effects. So I have two questions: Is this the best way to do it. If it is a reasonable approach, what magic combination of settings should I apply to the table layout panel to make it play ball?

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  • Permission denied when trying to execute a binary burned to a CD-R

    - by user16654
    On an Ubuntu 9.10 (Karmic Koala) machine, I burned a CD from the command prompt using: cdrecord -v speed=16 dev=0,1,0 /FPS.iso The CD now contains an executable and some files. I tested the CD by loading it onto another machine (Red Hat 5.3) and when I try to run the program I get the following message: bash: ./FPS1_1: Permission denied I can open other files like text documents (the executable also comes with shared libraries). I realized I had burned the CD as root so I burned another one as another user but I still have the same problem. How can I remove this permission or what is the problem? P.S. the image was in / if that helps

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  • Global temporary tables getting data from different session in Oracle

    - by Omnipresent
    We have a stored procedure in Oracle that uses global temporary tables. In most of our other stored procedures, first thing we do is delete data from global temporary tables. However, in few of the stored procedures we do not have the delete's. Are there any other options other than adding the delete statements? Can something be done on the Server side to forcefully delete data from those temporary tables when that SP is ran?

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  • embed flash in the background (hidden on the page)

    - by Matt
    Hey all, I'm trying to make an mp3 player that passes javascript events to a flash file. I'm not very saavy in flash so this may be a simple question.. but how do you make a "movie-less" flash file? Is it possible to just embed an actionscript file? Because that is really all I need to run. Side note: What is the easiest (and fastest) way to pass params to actionscript using javascript? Thanks, Matt Mueller

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  • how do i Raw url ENCODING/ DECODING in javascript and ruby to get the same answers in both?

    - by Mo
    Hi i am working on a web application where i have to encode and decode a string at the JavaScript side and ruby backend of the code. the only problem is that the escape methods for JavaScript and ruby have a small difference. in java script the " " is treated as "%20" but in ruby the " "(space) is encoded to "+". any way to work around this? another ruby method to encode a string in RAW url encode? thank you

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  • Windows 7 / Internet Explorer 8

    - by Rene
    I am a shop owner at zazzle.com. About six weeks ago, when my computer was running on Windows XP/IE7, my sites, as well as zazzle's homepages went out on me. I can only see part of each page. Since that time, I have a new computer running Windows 7/IE8, thinking that would solve the issue. It did not. Zazzle's emails told me to download Firefox and/or download Internet Explorer 7. I tried Firefox and was getting a different problem at the zazzle site. Now I was getting only the 'view source' pages on zazzle's homepages and my own shop sites as well. Question: Can I download IE 7 onto my IE 8 computer? Can this be done without loading that compilation of internet explorer 1 through 8? What do you think is the best solution to this problem?

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  • License plate recognition

    - by WowtaH
    As a side-project I'm trying to create an app that scans license plates from passing cars from my living-room window. I have hooked up a high resolution camera to my system to capture (moving) images into my c# app. Now all I need is a way to interpret these images into something readable. I´m thinking about some sort of OCR-solution that is fast/accurate enough for moving images. Hope you can give me some direction!

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  • How do I convert jstring to wchar_t *

    - by Obediah Stane
    Let's say that on the C++ side my function takes a variable of type jstring named myString. I can convert it to an ANSI string as follows: const char* ansiString = env-GetStringUTFChars(myString, 0); is there a way of getting const wchar_t* unicodeString = ...

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