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  • How would I recognize the "spoon-feeding problem" on a dynamic webapp server?

    - by Don Spaulding
    The "spoon-feeding problem", as it was recently explained to me, happens when connections to your application server are tied up feeding data across slow network connections to your clients. This makes sense to me and now I understand the importance of putting a highly-concurrent proxy in front of my app servers. My question is, how did the first person to recognize this problem figure it out? What *nix tools and troubleshooting techniques would help me to recognize this problem if I hadn't had it explained to me?

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  • iptables: Allow only HTTP access for web browsing

    - by user1448260
    Have a linux box, want it locked down but just be able to surf internet on it. Why is this script blocking http too? #!/bin/sh # # iptables -F # #Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # # Allow TCP connections on tcp port 80 # iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # List rules # iptables -L -v

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  • CNAME - how will the url be in the http request

    - by Traveller
    A newbie question regarding dns records Let's say I've configured, abc.example.com - A 10.x.x.x and a CNAME for xyz.example.com CNAME for xyz.example.com - abc.example.com when a user does an http request for xyz.example.com what happens when the request reach the 10.x.x.x server. Will the URL be abc.example.com or xyz.example.com? (trying to find out if virtual host in apache need to be updated) Thanks much

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  • Prevent abuse of public HTTP directory meant for images

    - by sutre
    The situation: Each user has their own public HTTP directory, meant for images only. This could easily be abused by users using it to serve large files, wasting bandwidth. The question: Is there any fairly simple way to prevent this abuse? Either by allowing the webserver to only images to be served, restricting size, or some other method.

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  • Partial Client Certificate request for Apache HTTP

    - by Joshua
    I have an Apache HTTP Server with SSL enabled and requesting a Client Certificate. How do I set up Apache to only request the certificate when a user hits a certain part of the website? Example: /myapp/ should not request the cert /myapp2/ should request the cert Note: These applications are being served using the mod-jk

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  • Strange exception when connecting to a WCF service via a proxy server

    - by Slauma
    The exception "This operation is not supported for a relative URI." occurs in the following situation: I have a WCF service: [ServiceContract(ProtectionLevel=ProtectionLevel.None)] public interface IMyService { [OperationContract] [FaultContract(typeof(MyFault))] List<MyDto> MyOperation(int param); // other operations } public class MyService : IMyService { public List<MyDto> MyOperation(int param) { // Do the business stuff and return a list of MyDto } // other implementations } MyFault and MyDto are two very simple classes marked with [DataContract] attribute and each only having three [DataMember] of type string, int and int?. This service is hosted in IIS 7.0 on a Win 2008 Server along with an ASP.NET application. I am using an SVC file MyService.svc which is located directly in the root of the web site. The service configuration in web.config is the following: <system.serviceModel> <services> <service name="MyServiceLib.MyService"> <endpoint address="" binding="wsHttpBinding" bindingConfiguration="wsHttpBindingConfig" contract="MyServiceLib.IMyService" /> </service> </services> <bindings> <wsHttpBinding> <binding name="wsHttpBindingConfig"> <security mode="None"> <transport clientCredentialType="None" /> </security> </binding> </wsHttpBinding> </bindings> <behaviors> <serviceBehaviors> <behavior> <serviceMetadata httpGetEnabled="false"/> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> This seems to work so far as I can enter the address http://www.domain.com/MyService.svc in a browser and get the "This is a Windows Communication Foundation Service"-Welcome page. One of the clients consuming the service is a console application: MyServiceClient aChannel = new MyServiceClient("WSHttpBinding_IMyService"); List<MyDto> aMyDtoList = aChannel.MyOperation(1); It has the following configuration: <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IMyService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="true" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="false" proxyAddress="10.20.30.40:8080" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://www.domain.com/MyService.svc" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IMyService" contract="MyService.IMyService" name="WSHttpBinding_IMyService" /> </client> </system.serviceModel> When I run this application at a production server at a customer site calling aChannel.MyOperation(1) throws the following exception: This operation is not supported for a relative URI. When I run this client application on my development PC with exactly the same config, with the exception that I remove proxyAddress="10.20.30.40:8080" from the bindings the operation works without problems. Now I really don't know what specifying a proxy server address might have to do with absolute or relative URIs. The use of the proxy server or not is the only difference I can see when running the client on the production or on the development machine. Does someone have an idea what this exception might mean in this context and how possibly to solve the problem? Thank you in advance for help!

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  • Selenium RC test - IE gives 403 error on Tomcat app, Tomcat root OK

    - by Ed Daniel
    I'm new to Selenium RC, having previously used Selenium IDE and only run tests in Firefox. I'm trying to get a basic test to run using Selenium RC through Eclipse; my test works OK in Firefox, and in Safari now that I've killed the pop-up blocker, but IE8 is causing a SeleniumException to be thrown, containing an "XHR ERROR" with a 403 response: com.thoughtworks.selenium.SeleniumException: XHR ERROR: URL = http://localhost:8080/pims Response_Code = 403 Error_Message = Forbidden at com.thoughtworks.selenium.HttpCommandProcessor.throwAssertionFailureExceptionOrError(HttpCommandProcessor.java:97) at com.thoughtworks.selenium.HttpCommandProcessor.doCommand(HttpCommandProcessor.java:91) at com.thoughtworks.selenium.DefaultSelenium.open(DefaultSelenium.java:335) at org.pimslims.seleniumtest.FirstTest.testNew(FirstTest.java:32) ... I can do a similar test on http:/ /localhost:8080 (space between the slashes here because SO thinks I'm spamming) and it's fine - I can make IE open that Tomcat default page and click a link. It's only if I try to open my application at http:/ /localhost:8080/pims that I see this error - and only in IE. I can open that URL in IE by typing it into the address bar. I was convinced that there's some setting in IE that's causing this, but I've tried everything I can think of. http:/ /localhost:8080 is in my Trusted Sites, and I've turned the security for that zone down to the minimum, allowed anything that looks related to popups, etc. If I try adding http:/ /localhost:8080/pims/ to Trusted Sites, IE says it's already there. I've also messed around with proxy settings, to no avail, but may have missed something obvious. I've tried starting the test with *iexplore, *iehta, and *iexploreproxy - all behave the same. Is there something I've missed? For reference, here is my test case - this works as is, in Firefox, opening the PIMS application's index page and clicking a link: public class FirstTest extends SeleneseTestCase { @Override public void setUp() throws Exception { this.setUp("http://localhost:8080/", "*firefox"); } public void testNew() throws Exception { final Selenium s = this.selenium; s.open("/pims"); s.click("logInOutLink"); s.waitForPageToLoad("30000"); } } Any help is greatly appreciated!

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  • Redirecting http request to two different weblogic servers using the Weblogic proxy and Apache2

    - by Jhon
    Hello All, I've read previous posts like "Redirecting https requests to two different weblogic servers using the Weblogic proxy and Apache2". But I have a different situation and I don't think I'm understanding this to well. I have an Apache 2 server (server1) that will receive http request for my application. Then I have two more servers (server2 and server3) with Web Logic 9.2 runing on ports 7000 (server1) and 8000 (server2). I want the users to enter appname.domain.com and be redirected between the two web logic servers, always keeping appname.domain.com (this is hidding servername:port from URL). How can I manage to do that? Thanks in advanced! Jhon.

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  • ANTLR parser hanging at proxy.handshake call

    - by Peter Boughton
    I am attempting to get a basic ECMAScript parser working, and found a complete ANTLR grammar for ECMAScript 3, which appears to compile ok and produces the appropriate Lexer/Parser/Walker Java files. (Running inside ANTLR IDE plugin for Eclipse 3.5) However, when actually trying to use it with some simple test code (following guide on ANTLR wiki), it just hangs when trying to create the parser: CharStream MyChars = new ANTLRFileStream(FileName); // FileName is valid ES3Lexer MyLexer = new ES3Lexer(MyChars); CommonTokenStream MyTokens = new CommonTokenStream(MyLexer); MyTokens.setTokenSource(MyLexer); ES3Parser MyParser = new ES3Parser( MyTokens ); // hangs here ES3Parser.program_return MyReturn = MyParser.program(); I've tracked down the problem to inside the ES3Parser constructor, where it's calling the function proxy.handshake() - before this line I can successfully do System.out.println("text") but after it I get nothing. So, how do I go about finding out why it's hanging, and stopping it - or even just bypassing this section (can/should I disable debugging?) - so long as that lets it work and allows me to get on with doing useful stuff.

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  • cURL requests changed

    - by Andriy Mytroshyn
    I've start work with cURL library, before work i compile library. i Send request and have some problem. Code in c++ that i used for work with cURL: CURL *curl=NULL; CURLcode res; struct curl_slist *headers=NULL; // init to NULL is important curl_slist_append(headers, "POST /oauth/authorize HTTP/1.1"); curl_slist_append(headers, "Host: sp-money.yandex.ru"); curl_slist_append(headers, "Content-Type: application/x-www-form-urlencoded"); curl_slist_append(headers, "charset: UTF-8"); curl_slist_append(headers, "Content-Length: 12345"); curl = curl_easy_init(); if(!curl) return 0; curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_URL, "sp-money.yandex.ru"); curl_easy_setopt(curl, CURLOPT_PROXY, "127.0.0.1:8888"); if( curl_easy_perform(curl)!=CURLE_OK) return 1; I've used proxy, fiddler2, for check what data sent to server. When i check sent data i get result: POST HTTP://sp-money.yandex.ru/ HTTP/1.1 Host: sp-money.yandex.ru Accept: */* Connection: Keep-Alive Content-Length: 151 Content-Type: application/x-www-form-urlencoded also i check this data using Wiresharck, result the same. Do you know why in first line cURL wrote: POST HTTP://sp-money.yandex.ru/ HTTP/1.1 I send POST /oauth/authorize HTTP/1.1 I've used VS 2010 for work, and also i don't used framework

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  • CURL & web.py: transfer closed with outstanding read data remaining

    - by Richard J
    Hi Folks, I have written a web.py POST handler, thus: import web urls = ('/my', 'Test') class Test: def POST(self): return "Here is your content" app = web.application(urls, globals()) if __name__ == "__main__": app.run() When I interact with it using Curl from the command line I get different responses depending on whether I post it any data or not: curl -i -X POST http://localhost:8080/my HTTP/1.1 200 OK Transfer-Encoding: chunked Date: Thu, 06 Jan 2011 16:42:41 GMT Server: CherryPy/3.1.2 WSGI Server Here is your content (Posting of no data to the server gives me back the "Here is your content" string) curl -i -X POST --data-binary "@example.zip" http://localhost:8080/my HTTP/1.1 100 Content-Length: 0 Content-Type: text/plain HTTP/1.1 200 OK Transfer-Encoding: chunked Date: Thu, 06 Jan 2011 16:43:47 GMT Server: CherryPy/3.1.2 WSGI Server curl: (18) transfer closed with outstanding read data remaining (Posting example.zip to the server results in this error) I've scoured the web.py documentation (what there is of it), and can't find any hints as to what might be going on here. Possibly something to do with 100 continue? I tried writing a python client which might help clarify: h1 = httplib.HTTPConnection('localhost:8080') h1.request("POST", "http://localhost:8080/my", body, headers) print h1.getresponse() body = the contents of the example.zip, and headers = empty dictionary. This request eventually timed out without printing anything, which I think exonerates curl from being the issue, so I believe something is going on in web.py which isn't quite right (or at least not sufficiently clear) Any web.py experts got some tips? Cheers, Richard

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  • Custom Logic and Proxy Classes in ADO.NET Data Services

    - by rasx
    I've just read "Injecting Custom Logic in ADO.NET Data Services" and my next question is, How do you get your [WebGet] method to show up in the client-side proxy classes? Sure, I can call this directly (RESTfully) with, say, WebClient but I thought the strong typing features in ADO.NET Data Services would "hide" this from me auto-magically. So here we have: public class MyService : DataService<MyDataSource> { // This method is called only once to initialize service-wide policies. public static void InitializeService(IDataServiceConfiguration config) { config.SetEntitySetAccessRule("Customers", EntitySetRights.AllRead); config.SetServiceOperationAccessRule("CustomersInCity", ServiceOperationRights.All); } [WebGet] public IQueryable<MyDataSource.Customers> CustomersInCity(string city) { return from c in this.CurrentDataSource.Customers where c.City == city select c; } } How can I get CustomersInCity() to show up in my client-side class defintions?

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  • ODBC Proxy for remotely accessing legacy resources?

    - by Winston Fassett
    Our project uses AcuCorp's AcuODBC driver to access a legacy Vision database. The problem is that we only have a 32-bit driver and the installer simply won't run on our 64-bit servers. I need a way to use SSIS to pull data from that system. As far as I can tell, there are 3 options: Set up a whole new SQL Server instance with SSIS and the AcuODBC drivers on a 32-bit VM (costly) Try to hack the 32-bit driver onto our 64-bit server manually (failure prone and unsupported) Set up a 32-bit VM with some sort of "proxy" service that our 64-bit SSIS can use to pull the data. The first option is the least desirable. If you have any suggestions for options 2 or 3, or anything else I haven't thought of, I'd love to hear them.

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  • Django as S3 proxy

    - by schneck
    Hi there, I extended a ModelAdmin with a custom field "Download file", which is a link to a URL in my Django project, like: http://www.myproject.com/downloads/1 There, I want to serve a file which is stored in a S3-bucket. The files in the bucket are not public readable, and the user may not have direct access to it. Now I want to avoid that the file has to be loaded in the server memory (these are multi-gb-files) avoid to have temp files on the server The ideal solution would be to let django act as a proxy that streams S3-chunks directly to the user. I use boto, but did not find a possibility to stream the chunks. Any ideas? Thanks.

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  • ASP.NET Request.ServerVariables["SERVER_PORT_SECURE"] and proxy SSL by load balancer

    - by frankadelic
    We have some legacy ASP.NET code that detects if a request is secure, and redirects to the https version of the page if required. This code uses Request.ServerVariables["SERVER_PORT_SECURE"] to detect if SSL is needed. Our operations team has suggested doing proxy SSL at the load balancer (F5 Big-IP) instead of on the web servers (assume for the purposes of this question that this is a requirement). The consequence would be that all requests appear as HTTP to the web server. My question: how can we let the web servers known that the incoming connection was secure before it hit the load balancer? Can we continue to use Request.ServerVariables["SERVER_PORT_SECURE"]? Do you know of a load balancer config that will send headers so that no application code changes are needed?

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  • NHibernate: uninitialized proxy passed to save() and cascade

    - by jonnii
    Hi, I keep getting an NHibernate.PersistentObjectException when calling session.Save() which is due to an uninitialized proxy passed to save(). If I fiddle with my cascade settings I can make it go away, but then child objects aren't being saved. The only other fix I have found is by adding the following to my DefaultSaveEventListener. protected override bool ReassociateIfUninitializedProxy(object obj, global::NHibernate.Engine.ISessionImplementor source) { if (!NHibernateUtil.IsInitialized(obj)) NHibernateUtil.Initialize(obj); return base.ReassociateIfUninitializedProxy(obj, source); } This is obviously not an ideal solution. Any ideas?

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  • code to ping websites works sometimes ...

    - by trustfundbaby
    I'm testing out a piece of code to ping a bunch of websites I own on a regular basis, to make sure they're up. I'm using rails and so far I have this hideous test action that I'm using to try it out (see below). The problem though, is that sometimes it works, and other times it won't ... sometimes it runs through the code just fine, other times, it seems to completely ignore the begin/rescue block ... a. I need help figuring out what the problem is b. And refactoring this to make it look respectable. Your help is much appreciated. require 'net/http' require 'uri' def ping @sites = NewsSource.all @sites.each do |site| if site.uri and !site.uri.empty? uri = URI.parse(site.uri) response = nil path = uri.path.blank? ? '/' : uri.path path = uri.query.blank? ? path : "#{path}?#{uri.query}" begin Net::HTTP.start(uri.host, uri.port) {|http| http.open_timeout = 30 http.read_timeout = 30 response = http.head(path) } if response.code.eql?('200') or response.code.eql?('301') or response.code.eql?('302') site.up = true else site.up = false end site.up_check_msg = response.message site.up_check_code = response.code rescue Errno::EBADF rescue Timeout::Error site.up = false site.up_check_msg = 'timeout' site.up_check_code = '408' end site.up_check_time = 0.seconds.ago site.save end end end

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  • WCF: Proxy open and close - whaaa?

    - by MikeMalter
    I am maintaing a windows form application using WCF and are using net.tcp internally. The lifecycle of our connections is GET/USE/CLOSE. We are having a problem with the application pool crashing with no trace. In looking at netstat, I can see when I come into the application as we have a login service. However, even though we are creating the proxy in a using statement, the connection in netstat does not go away until I physically close the application. Is this right? Should I be doing something diffent on the client to force the connection to close? So if the connection stays open, does it stay open for the duration of the openTimeout setting and then gets torn down? Thanks.

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  • Do not use IE browser settings when using a proxy with Indy

    - by JD
    Hi At one of our customer sites, we have a Delphi 2007 application that makes a number of HTTPS requests using indy components. All requests are made using the proxy settings the client provides. For this to work, in IE we have to put the URL's in the trusted zones section. After a month due to security settings the trusted zones are cleared. This means we have to re-add the URLs again to make our application work. Is there a way of bypassing IE settings or using a client side HTTP stack so we do not go through the browser to make https requests? JD

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  • Service Contracts with Message causes duplicate proxy classes

    - by jaklucky
    Hi, I have a service contract with Message as shown below. [OperationContract] Message MyMethodWithMessage(Message myMsgParam); Everything works fine. I could host my services. But when I try to create proxies through "Add Service References", I am getting the duplicate proxy classes. If I take out the above OperationContract and re run my services and try to create proxies, then "Add Service References" does not provide duplicate proxies. I am really confused about this!!! Any help is greatly appreciated... Thank you, Suresh

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  • Proxy object references in MVC code

    - by krystan honour
    Hi there, I am just figuring out best practice with MVC now I have a project where we have chosen to use it in anger. My question is. If creating a list view which is bound to an IEnumerable is this bad practise? Would it be better to seperate the code generated by the WCF Service reference into a datastructure which essentially holds the same data but abstracts further from the service, meaning that the UI is totally unaware of the service implementation beneath. or do people just bind to the proxy object types and have done with it ? My personal feeling is to create an abstraction but this seems to violate the DRY principle.

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  • Get Browser to send both If-None-Match and If-Modified-Since

    - by Glen
    My Browser isn't sending back an If-Modified-Since Header for PHP generated Content on the first request my script sends: (Status-Line) HTTP/1.1 200 OK Date Thu, 21 Jan 2010 08:55:25 GMT Server Apache/2.2.11 (Win32) PHP/5.2.9-1 X-Powered-By PHP/5.2.9-1 Pragma no-cache x-ua-compatible IE=8;FF=3;OtherUA=4 Last-Modfied Sat, 02 Jan 2010 02:02:20 GMT Content-Length 28453 Etag b98e0795b509be20146f58e06fbb624f Keep-Alive timeout=5, max=90 Connection Keep-Alive Content-Type image/png it on the second request it sends: (Request-Line) GET /kincumberunitingchurch/banner_image.php?id=1 HTTP/1.1 Host localhost User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17 Accept image/png,image/*;q=0.8,*/*;q=0.5 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 300 Connection keep-alive Referer http://localhost/kincumberunitingchurch/index.php?sid=tgl9jq3f71nau3cj9vps6pna03 Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4 If-None-Match b98e0795b509be20146f58e06fbb624f Cache-Control max-age=0 for other files the sever sends first: (Status-Line) HTTP/1.1 200 OK Date Thu, 21 Jan 2010 08:55:25 GMT Server Apache/2.2.11 (Win32) PHP/5.2.9-1 Last-Modified Wed, 30 Dec 2009 02:40:58 GMT Etag "1000000013d35-40d9-47be9117f6280" Accept-Ranges bytes Content-Length 16601 Keep-Alive timeout=5, max=84 Connection Keep-Alive Content-Type image/png and my browser send the following on the next request: (Request-Line) GET /kincumberunitingchurch/img/cbuttons.png HTTP/1.1 Host localhost User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17 Accept image/png,image/*;q=0.8,*/*;q=0.5 Accept-Language en-us,en;q=0.5 Accept-Encoding gzip,deflate Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive 300 Connection keep-alive Referer http://localhost/kincumberunitingchurch/mystyle.css Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4 If-Modified-Since Wed, 30 Dec 2009 02:40:58 GMT If-None-Match "1000000013d35-40d9-47be9117f6280" Cache-Control max-age=0 why would it send the If-Modified-Since header

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