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• Amazon EC2 Load Balancer: Defending against DoS attack?

  - by netvope

  We usually blacklist IPs address with iptables. But in Amazon EC2, if a connection goes through the Elastic Load Balancer, the remote address will be replaced by the load balancer's address, rendering iptables useless. In the case for HTTP, apparently the only way to find out the real remote address is to look at the HTTP header HTTP_X_FORWARDED_FOR. To me, blocking IPs at the web application level is not an effective way. What is the best practice to defend against DoS attack in this scenario? In this article, someone suggested that we can replace Elastic Load Balancer with HAProxy. However, there are certain disadvantages in doing this, and I'm trying to see if there is any better alternatives.

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• Setting a Silverlight textbox control's width relatively

  - by John K.

  Hello, I tried searching on stackoverflow for an answer to my question but couldn't seem to find anything relevant. Since I'm relatively new to Silverlight, I'm not even sure if this is possible, but I am trying to figure out if it is possible to set a Silverlight textbox control's width value proportionally to it's immediate parent container? It would be nice to avoid hard coding a width value. Say you want to place a textbox control inside a horizontally aligned StackPanel control and have it's width always dynamically adjusted to be 80% of the total width of the StackPanel. Is this possible to do declaratively in your xaml markup, or will I need to resort to some codebehind attached to some event handler to accomplish this? fyi, I am currently using Visual Web Developer Express 2008 to write my silverlight code. thanks in advance, John

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• Neither IE or Firefox respects the control values that are output

  - by Luke Rohde

  I'm writing a survey designer asp.net mvc. It has buttons to move questions up and down. The buttons post the whole form back and the affected questions are swapped on the server. When the form returns the only thing that is changed are the values for each survey question. Both firefox and IE seem to ignore this change. Nothing is persisted to the database (until save) and url doesn't change so the post just returns the same view but I've stepped through my code to ensure the sequence of values being rendered in the view reflects the swap which is ok. However "view - source" doesn't show the change suggesting caching issue (maybe auto complete). I've tried autocomplete="off" in my form. Response.Cache.SetNoStore(); in my global.asax [System.Web.Mvc.OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")] before my controller and the following in my page header NOTHING!!! This must be real common. Anyone got a clue?

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• iTunes Music Store Link Maker — how to search from within my app?

  - by prendio2

  I'm writing a music reference app and for each album (pulled from last.fm) would like to link to the ITMS (if the album is in the store). iTunes link maker web tool http://apple.com/itunes/linkmaker/ is great for getting links for a known album but I need to access it programatically from within my app. This NSLog blogpost which is from 2003 but was referenced more recently in another question here seems to offer the only solution I've come across so far, suggesting to submit a query to: phobos.apple.com/WebObjects/MZSearch.woa/wa/advancedSearchResults? Put "itms://" before it and the link will work in iTunes, put "http://" before it and the link will work in Camino (Safari sometimes spits back a malformed XML error). The tags that are of importance are as follows: songTerm - song title artistTerm - artist name albumTerm - album name composerTerm - composer name term - all fields The suggestion is that would using http:// rather than itms:// the server will return an XML document of results instead of opening iTunes but either way I am sent directly to iTunes. Is it possible to get back a list of results?

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• Doing Forms With Just Windows SharePoint Services 3.0?

  - by tekiegreg

  For the most part my organization is happy with WSS 3.0 (no upgrading to MOSS) with one exception, there is really just one form we'd like to put up somehow. It's fairly big form (basically change requests for IT services, on paper it's easily 2 full 8.5 by 11 pages). We thought about Custom ASP.NET coding as a separate stand-alone page or maybe as a web part. What have other people out there done? MOSS and Infopath is not really an option as it really is too expensive for us at this time. Thanks in advance!

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• How do I change a Git remote HEAD to point to something besides "master"

  - by jhs

  Short version: How do I set a Git remote's HEAD ref to point to something besides "master"? My project has a policy not to use a "master" branch (all branches are to have meaningful names). Furthermore, the canonical master repository is only accessible via ssh://, with no shell access (like GitHub or Unfuddle). My problem is that the remote repository still has a HEAD reference to refs/heads/master, but I need it to point to a different branch. This is causing two problems: When cloning the repo, there this, warning: remote HEAD refers to nonexistent ref, unable to checkout. That's confusing and inconvenient. The web-based code browser depends on HEAD as a basis for browsing the tree. I need HEAD to point to a valid branch, then.

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• display of umlauts in firefox

  - by Mike D

  I was doing some web searching and found some strange things involving umlauts. For example if you do a google or yahoo search for the word "nther" you are likely to find things like G&#xfc;nther which I take to be Gunther with an umlaut over the u. Now my question is what if anything can I do to cause these characters to be properly displayed by Firefox under windows XP? An amazing thing is that I had to introduce spaces in the G & # etc string otherwise it was properly displayed here as u with umlaut!

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• How would you adblock using Python?

  - by regomodo

  I'm slowly building a web browser in PyQt4 and like the speed i'm getting out of it. However, I want to combine easylist.txt with it. I believe adblock uses this to block http requests by the browser. How would you go about it using python/PyQt4? [edit1] Ok. I think i've setup Privoxy. I haven't setup any additional filters and it seems to work. The PyQt4 i've tried to use looks like this self.proxyIP = "127.0.0.1" self.proxyPORT= 8118 proxy = QNetworkProxy() proxy.setType(QNetworkProxy.HttpProxy) proxy.setHostName(self.proxyIP) proxy.setPort(self.proxyPORT) QNetworkProxy.setApplicationProxy(proxy) However, this does absolutely nothing and I cannot make sense of the docs and can not find any examples. [edit2] I've just noticed that i'f I change self.proxyIP to my actual local IP rather than 127.0.0.1 the page doesn't load. So something is happening.

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• asp.net membership select provider

  - by Jonesy

  Hi folks, I've done this before but can't remember how for the life of me. I used aspnetreg_sql.exe to create the membership tables in my database. But now i cant seem to be able to point my web app to the correct database. In the provider settings in asp.net management interface i only see a radio button with the label "AspNetSqlProvider" but I can only test it (in which it always fails). I can't modify the connection. Can someone help me with this? Cheers, Billy

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• Using VRaptor3 with Tomcat UnpackWARs property setted to false

  - by VinTem

  Hi there, I have to deploy my web app to a tomcat container with the unpackWARs property defined to false. When I do that, although the application is successfully deployed, when I try to access my url I always got a 404 error. I just don't receive that error when I try to access a direct file like index.html for instance. But I can't do that, the VRaptor framework is responsible for routing my url to the jsp file. Does anyone know if I have do anything else? Thanx

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• Android Market, Search results position Mystery.

  - by Paul G.

  How is an app's position in the Android Market search results determined? Is it as mysterious and complex as Google Web search results? We obviously don't want to change any words in our app's title or description that would hurt our position. Same question applies for not only search results, but when clicking on a Category in the Android Market. How is the order of the list determined? Hopefully someone here can help. I would think that Google would have published some guidelines at least that could help, but I haven't found anything yet.

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• Is google gson running on android?

  - by Janusz

  I'm playing arround with google gson for communication with my web back end at the moment. This and this older posts indicate that there are some problems with gson on android. I did some easy tests on the device already but maybe I just missed the bug. Edit I'm now parsing a lot more data. Generic lists etc. still not encountered the bug. Has anybody used gson on Android already? How does it work? Has somebody encountered bugs or something that will stop me from using it once it gets more complicated?

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• How to make a Webservice request follow a redirect?

  - by frappuccino

  My application neeeds to access a third part web service. Of late, they have introduced a load balancer, which redirects to the server. Because of this the webservice gets a 302 - Redirect error as response. In the SOAPUI, I was able to enable a property called "Follow Redirect", and because of this service followed the redirect and served by the server. Now is there a similar propety that can be turned on in the code, which would make the webservice follow the request? (The calling code is java and the webservice is in .net)

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• Xcode 4.2 how include one project into another one?

  - by Alex Stone

  I keep searching, but cannot find a clear and simple explanation on how to include one XCode project, along with all of it's sub-classes into another project. I routinely see stuff like that in sample projects that I download off the web, but do not know how to do this myself. Within XCode, along with .h and .m files, and folders, there's a whole new project, starting with a blue xcode project icon, that is expandable to contain everything within the project. Please, can someone explain to me step by step what do I need to do to add one XCode project into another one? I've seen a ton of one liners like "header search paths", but that does not tell me much. UPDATE: After re-reading the documentation, I realized that the project to include must be dragged ONTO the BLUE project icon of the parent project. Regular sources can be dragged anywhere, but a project must be dragged onto a project. Thank you!

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• Why not use javascript handlers on the body element?

  - by disown

  As an answer to the question of 'How do you automatically set the focus to a textbox when a web page loads?', Espo suggests using <body onLoad="document.getElementById('<id>').focus();"> Ben Scheirman replies (without further explanation): Any javascript book will tell you not to put handlers on the body element like that Why would this be considered bad practice? In Espos answer, an 'override' problem is illustrated. Is this the only reason, or are there any other problems? Compatibility issues?

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• How to find two most distant points?

  - by depesz

  This is a question that I was asked on a job interview some time ago. And I still can't figure out sensible answer. Question is: you are given set of points (x,y). Find 2 most distant points. Distant from each other. For example, for points: (0,0), (1,1), (-8, 5) - the most distant are: (1,1) and (-8,5) because the distance between them is larger from both (0,0)-(1,1) and (0,0)-(-8,5). The obvious approach is to calculate all distances between all points, and find maximum. The problem is that it is O(n^2), which makes it prohibitively expensive for large datasets. There is approach with first tracking points that are on the boundary, and then calculating distances for them, on the premise that there will be less points on boundary than "inside", but it's still expensive, and will fail in worst case scenario. Tried to search the web, but didn't find any sensible answer - although this might be simply my lack of search skills.

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• Kohana 3 simple relations..

  - by matiit

  I'm trying to write a very simple cms (for learning purposes) in kohana 3 web framework. I have my db schemas and i want to map it to ORM but i have problems with relations. Schemas:articles and categories One article has one category. One category might has many articles of course. I think it is has_one relationship in article table.(?) Now php code. I need to create application/classes/models/article.php first, yes? class Model_Article extends ORM { protected // and i am not sure what i suppose to write here }

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• Connection string in app.config in a class library

  - by Copeleto

  I am creating solution and inside I have three projects: A WCF Service Library Project A DataAccess Project (Class Library) A Web site for hosting WCF service The implementation of the service is on the project # 1, but in order to access the DataBase I use a second project that implements the data access using a class library project. That problem is in order to get data access I need to configure a connection string, but that connection string must be configurable in a production environment, I meant in production I am going to deploy the site, which is a very simple project that contains only a reference WCF Service Library Project then a guy from database department will configure the connection string. In development I have an app.config on the data access project but when I do the release that app.config is embedded on the dll. Any ideas how can we achieve our purpose

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• Is Oracle AQ/Streams of any use in my situation?

  - by RenderIn

  I'm writing a workflow system that is driven entirely at each step by explicit human interaction. That is, a task is assigned to a person, that person selects from a few limited options {approve, reject, forward}, and then it is either sent along to the next person or terminated. Just curious of Oracle Streams/AQ has anything to offer over flat tables managed by regular web application code. The amount of processing after each action is fairly limited and the volume is not terribly high, so there's not really a need to throttle things by throwing them into a queue. What are some of the benefits of introducing a queue structure, or is it overkill for my situation?

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• IIS 7: Redirect all request to Default.aspx

  - by EtienneT

  We want to redirect all request in an ASP.NET site to ~/Default.aspx to close the site. We are using IIS7. The site has paths like this that return a page: http://test.com/operating We are using url rewriting. We want requests similar to those to be redirected to ~/Default.aspx http://test.com// http://test.com/.aspx http://test.com//.aspx We would normaly use something like this in web.config: <customErrors mode="On" defaultRedirect="Default.aspx"> <error statusCode="404" redirect="Default.aspx" /> </customErrors> The problem with this is that it won't redirect folder url like this http://test.com/*/ Thanks!

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• How can I pause a BackgroundWorker? Or something similar...

  - by juan

  I was using a BackgroundWorker to download some web sites by calling WebClient.DownloadString inside a loop. I wanted the option for the user to cancel in the middle of downloading stuff, so I called CancelAsync whenever I found that CancellationPending was on in the middle of the loop. But now I noticed that the function DownloadString kinda freezes sometimes, so I decided to use DownloadStringAsync instead (all this inside the other thread created with BackgroundWorker). An since and don't want to rewrite my whole code by having to exit the loop and the function after calling DownloadStringAsync, I made a while loop right after calling it that does nothing but checks for a variable bool Stop that I turn true either when the DownloadStringCompleted event handler is called or when the user request to cancel the operation. Now, the weird thing is that it works fine on the debug version, but on the release one, the program freezes in the while loop like if it were the main thread.

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• Python mechanize - two buttons of type 'submit'

  - by directedition

  I have a mechanize script written in python that fills out a web form and is supposed to click on the 'create' button. But there's a problem, the form has two buttons. One for 'add attached file' and one for 'create'. Both are of type 'submit', and the attach button is the first one listed. So when I select the forum and do br.submit(), it clicks on the 'attach' button instead of 'create'. Extensive Googling has yielded nothing useful for selecting a specific button in a form. Does anyone know of any methods for skipping over the first 'submit' button and clicking the second?

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• linking to an app on the Itunes store

  - by William Jockusch

  A few web searches yield all sorts of contradictory advice on linking from an iPhone app to an app on the store. Here are some links that come up, together with comments from testing: http://itunes.apple.com/us/app/anagramania/id360016055?mt=8 -- works great. But is it US only? "http://itunes.com/apps/anagramania" -- works after a bunch of redirects, which are likely to annoy the customer. @"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=360016055&mt=8"]; -- works great. But Apple appears to be trying to remove "phobos" links from its documentation. @"http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=360016055&mt=8"]; -- works great, but Apple's documentation mentions problems with similar links. Apple doc here: http://developer.apple.com/iphone/library/qa/qa2008/qa1633.html#STANDARD_APPSTORE_LINKS Can anyone bring order out of this chaos?

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• How can I create a javascript library in a separate file and "include" it in another?

  - by Jordan L. Walbesser

  First, a caveat. The main script is not run in a webpage. I will be running the .js file in Windows using Windows Script Host. The problem: I would like to create a javascript "library" containing a number of objects, each with a number of functions. I expect this library will get rather large with time and would like to keep it in a separate javascript file (let's call it Library.js). I would like to access the objects from Library.js from another script (let's call this one User.js). In essence, I am looking for something similar to the C/C++ "include" paradigm. Is there anyway to implement this in javascript? (Remember, this is not web-based)

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• Sending data remotely from iPhone native apps to Rails apps

  - by jpartogi

  Dear all, I have decided to develop a native iPhone apps as a compliment to our webapps. Now I am wondering what are my options to send data remotely from the iPhone apps - since the database is online - to our online database. What I can think of on top of my head - since I come from web dev background - is JSON. My webapps is built using Rails, so I figure it would not be difficult to accept JSON request from the iPhone apps. But the next question is, is it difficult to send JSON data remotely from the iPhone apps? If JSON is not recommendable, what are my other options? Thank you so much for the assistance. Really appreciate it.

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