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  • CRC for PNG file format

    - by darkie15
    Hi All, I need to read a PNG file and interpret all the information stored in it and print it in human readable format. While working on PNG, i understood that it uses CRC-32 for generating checksum for each chunk. But I could not understand the following information mentioned on the PNG file specification site: The polynomial used by PNG is: x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1 Here is the link for reference: http://www.w3.org/TR/PNG/ Can anyone please help me in understanding this? Regards, darkie

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  • Why browser vendors make their own css properties?

    - by jitendra
    Why browser vendors make their own css properties, even they know these will not pass the w3c validation? What is the purpose? is for their own testing, or for web developers, ot to demonstrate browser capabilities to the world and to the W3C organizations and to CSS development team of W3C? is it like a beta version of demonstration? if i use any browser specific for now can they remove that property's support from future versions.will i have to edit my css in future for example: https://developer.mozilla.org/en/CSS_Reference/Mozilla_Extensions

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  • Selenium IDE and Drupal

    Can I use Selenium IDE on a Drupal system? I found http://drupal.org/project/selenium but that involves downloading Core and not using my current machine. Does anybody know of a way to use the IDE with Drupal, or if not what do you suggest I do?

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  • Difference between OData and REST web services

    - by Scott
    While looking into some web services, I ran across this "new" technology that Microsoft is calling OData. (http://www.odata.org) Reading through their description within the FAQ on what OData is, I am having a hard time distinguishing OData from REST-ful web services. Could someone please help me understand the differences?

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  • What is "Call By Name"?

    - by forellana
    Hi to everyone! I'm working in a homework, and the professor asked me to implement the evaluation strategy called "call by name" in scheme in a certain language that we developed and he gave us an example at http://www.scala-lang.org/node/138 in the scala language, but i don't understand in what consists the call by name evaluation strategy? what differences it has with call by need? thanks, greetings

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  • Serializing Class Derived from Generic Collection yet Deserializing the Generic Collection

    - by Stacey
    I have a Repository Class with the following method... public T Single<T>(Predicate<T> expression) { using (var list = (Models.Collectable<T>)System.Xml.Serializer.Deserialize(typeof(Models.Collectable<T>), FileName)) { return list.Find(expression); } } Where Collectable is defined.. [Serializable] public class Collectable<T> : List<T>, IDisposable { public Collectable() { } public void Dispose() { } } And an Item that uses it is defined.. [Serializable] [System.Xml.Serialization.XmlRoot("Titles")] public partial class Titles : Collectable<Title> { } The problem is when I call the method, it expects "Collectable" to be the XmlRoot, but the XmlRoot is "Titles" (all of object Title). I have several classes that are collected in .xml files like this, but it seems pointless to rewrite the basic methods for loading each up when the generic accessors do it - but how can I enforce the proper root name for each file without hard coding methods for each one? The [System.Xml.Serialization.XmlRoot] seems to be ignored. When called like this... var titles = Repository.List<Models.Title>(); I get the exception <Titlesxmlns=''> was not expected. The XML is formatted such as. .. <?xml version="1.0" encoding="utf-16"?> <Titles xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <Title> <Id>442daf7d-193c-4da8-be0b-417cec9dc1c5</Id> </Title> </Titles> Here is the deserialization code. public static T Deserialize<T>(String xmlString) { System.Xml.Serialization.XmlSerializer XmlFormatSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T)); StreamReader XmlStringReader = new StreamReader(xmlString); //XmlTextReader XmlFormatReader = new XmlTextReader(XmlStringReader); try { return (T)XmlFormatSerializer.Deserialize(XmlStringReader); } catch (Exception e) { throw e; } finally { XmlStringReader.Close(); } }

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  • Non ASCII char in PHP?

    - by domagoj412
    Hello, I am trying to send something to serial port (r232) with PHP. I am using this class: http://www.phpclasses.org/browse/package/3679.html The problem is that I am allowed to send only 1 byte. But if I send something like "1", I am actually sending 49 (ASCII for 1). Instead of send("1"), I tried with send(1) but it is no good, because this is integer which has 2 bytes. So is there a way to send a "real" char, not ASCII equivalent?

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  • ruby on rails setup on my ubuntu

    - by hiren
    Do I need to set up virtual hosts as mentioned here: http://wiki.rubyonrails.org/deployment/apache-passenger I am just setting up dev env on my own machine to try and learn ruby on rails. thanks in advance.

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  • Algorithm for dividing very large numbers

    - by pocoa
    I need to write an algorithm(I cannot use any 3rd party library, because this is an assignment) to divide(integer division, floating parts are not important) very large numbers like 100 - 1000 digits. I found http://en.wikipedia.org/wiki/Fourier_division algorithm but I don't know if it's the right way to go. Do you have any suggestions?

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  • ASP.Net Checkbox value at postback is wrong?

    - by Duracell
    We have a checkbox that is initially disabled and checked. It is then enabled on the client side through javascript. If the user then unchecks the box and presses the button to invoke a postback, the state of the checkbox remains as checked on the server side. This is obviously undesirable behaviour. Here is an example. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="testcb.aspx.cs" Inherits="ESC.testcb" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <script type="text/javascript"> function buttonClick() { var cb = document.getElementById('<%= CheckBox1.ClientID %>'); cb.disabled = false; cb.parentNode.disabled = false; } </script> <div> <asp:CheckBox ID="CheckBox1" runat="server" Checked="true" Enabled="false" /> <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="buttonClick(); return false;" /> <asp:Button ID="Button2" runat="server" Text="Button2" OnClick="button2Click" /> </div> </form> </body> </html> And the Server-side code: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace ESC { public partial class testcb : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void button2Click(object sender, EventArgs e) { string h = ""; } } } So we break at the "string h" line and check the value of CheckBox1.Checked. It is true, even if it is unchecked on the form.

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  • Google Checkout. Show shipping rates before logging in possible?

    - by Roeland
    I am trying to integrate google checkout with my current site. I am calculating the shipping on my end, before passing it to google checkout. The problem is, when a person click the "google checkout" button, it takes them to google checkout but it does not show the shipping. It actually states it will be calculated on next step. In the next step it actually shows a drop down with the ONE option for shipping that I passed, which is a flat rate.. The problem is, to get to the next step you have to enter a credit card. Also, my shop has the shipping shown in the cart, so it would seem confusing to go to checkout and have a price without shipping. Here is the test code I am using right now to see if I can get it to show shipping before logging in (sample it here: http://sensenich.bythepixel.com/test.html) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <title>Site Title</title> </head> <body> <form method="POST" action="https://sandbox.google.com/checkout/api/checkout/v2/checkoutForm/Merchant/468503062558352" accept-charset="utf-8"> <input type="hidden" name="item_name_1" value="Peanut Butter"/> <input type="hidden" name="item_description_1" value="Chunky peanut butter."/> <input type="hidden" name="item_quantity_1" value="1"/> <input type="hidden" name="item_price_1" value="3.99"/> <input type="hidden" name="item_currency_1" value="USD"/> <input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.name" value="UPS Next Day Air"/> <input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.price" value="20.00"/> <input type="hidden" name="checkout-flow-support.merchant-checkout-flow-support.shipping-methods.flat-rate-shipping-1.price.currency" value="USD"/> <input type="hidden" name="_charset_" /> <!-- Button code --> <input type="image" name="Google Checkout" alt="Fast checkout through Google" src="http://sandbox.google.com/checkout/buttons/checkout.gif?merchant_id=468503062558352&w=180&h=46&style=white&variant=text&loc=en_US" height="46" width="180" /> </form> </body> </html>

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  • Installing my sdist from PyPI puts the files in the wrong places

    - by Tartley
    Hey. My problem is that when I upload my Python package to PyPI, and then install it from there using pip, my app breaks because it installs my files into completely different locations than when I simply install the exact same package from a local sdist. Installing from the local sdist puts files on my system like this: /Python27/ Lib/ site-packages/ gloopy-0.1.alpha-py2.7.egg/ (egg and install info files) data/ (images and shader source) doc/ (html) examples/ (.py scripts that use the library) gloopy/ (source) This is much as I'd expect, and works fine (e.g. my source can find my data dir, because they lie next to each other, just like they do in development.) If I upload the same sdist to PyPI and then install it from there, using pip, then things look very different: /Python27/ data/ (images and shader source) doc/ (html) Lib/ site-packages/ gloopy-0.1.alpha-py2.7.egg/ (egg and install info files) gloopy/ (source files) examples/ (.py scripts that use the library) This doesn't work at all - my app can't find its data files, plus obviously it's a mess, polluting the top-level /python27 directory with all my junk. What am I doing wrong? How do I make the pip install behave like the local sdist install? Is that even what I should be trying to achieve? Details I have setuptools installed, and also distribute, and I'm calling distribute_setup.use_setuptools() WindowsXP, Python2.7. My development directory looks like this: /gloopy /data (image files and GLSL shader souce read at runtime) /doc (html files) /examples (some scripts to show off the library) /gloopy (the library itself) My MANIFEST.in mentions all the files I want to be included in the sdist, including everything in the data, examples and doc directories: recursive-include data *.* recursive-include examples *.py recursive-include doc/html *.html *.css *.js *.png include LICENSE.txt include TODO.txt My setup.py is quite verbose, but I guess the best thing is to include it here, right? I also includes duplicate references to the same data / doc / examples directories as are mentioned in the MANIFEST.in, because I understand this is required in order for these files to be copied from the sdist to the system during install. NAME = 'gloopy' VERSION= __import__(NAME).VERSION RELEASE = __import__(NAME).RELEASE SCRIPT = None CONSOLE = False def main(): import sys from pprint import pprint from setup_utils import distribute_setup from setup_utils.sdist_setup import get_sdist_config distribute_setup.use_setuptools() from setuptools import setup description, long_description = read_description() config = dict( name=name, version=version, description=description, long_description=long_description, keywords='', packages=find_packages(), data_files=[ ('examples', glob('examples/*.py')), ('data/shaders', glob('data/shaders/*.*')), ('doc', glob('doc/html/*.*')), ('doc/_images', glob('doc/html/_images/*.*')), ('doc/_modules', glob('doc/html/_modules/*.*')), ('doc/_modules/gloopy', glob('doc/html/_modules/gloopy/*.*')), ('doc/_modules/gloopy/geom', glob('doc/html/_modules/gloopy/geom/*.*')), ('doc/_modules/gloopy/move', glob('doc/html/_modules/gloopy/move/*.*')), ('doc/_modules/gloopy/shapes', glob('doc/html/_modules/gloopy/shapes/*.*')), ('doc/_modules/gloopy/util', glob('doc/html/_modules/gloopy/util/*.*')), ('doc/_modules/gloopy/view', glob('doc/html/_modules/gloopy/view/*.*')), ('doc/_static', glob('doc/html/_static/*.*')), ('doc/_api', glob('doc/html/_api/*.*')), ], classifiers=[ 'Development Status :: 1 - Planning', 'Intended Audience :: Developers', 'License :: OSI Approved :: BSD License', 'Operating System :: Microsoft :: Windows', 'Programming Language :: Python :: 2.7', ], # see classifiers http://pypi.python.org/pypi?:action=list_classifiers ) config.update(dict( author='Jonathan Hartley', author_email='[email protected]', url='http://bitbucket.org/tartley/gloopy', license='New BSD', ) ) if '--verbose' in sys.argv: pprint(config) setup(**config) if __name__ == '__main__': main()

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  • Ruby Hide Console

    - by Ell
    I am attempting to make a game written in Ruby using the Gosu library (http://www.libgosu.org/) but when I run the game, a console also shows. How do I make sure the console is hidden from the start? thanks in advance, ell

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  • Unable to have nokogiri obey custom path parameters during install

    - by Christopher
    I am trying to install nokogiri locally on dreamhost using the commands: $ wget ftp://xmlsoft.org/libxml2/libxml2-2.7.6.tar.gz $ wget ftp://xmlsoft.org/libxml2/libxslt-1.1.26.tar.gz $ tar zxvf libxml2-2.7.6.tar.gz $ cd libxml2-2.7.6 $ ./configure --prefix=$HOME/local/ --exec-prefix=$HOME/local $ make && make install $ cd .. $ tar zxvf libxslt-1.1.26.tar.gz $ cd libxslt-1.1.26 $ ./configure --prefix=$HOME/local/ --with-libxml-prefix=$HOME/local/ $ make && make install $ export LD_LIBRARY_PATH=$HOME/local/lib $ gem install nokogiri -- --with-xslt-dir=$HOME/local \ --with-xml2-include=$HOME/local/include/libxml2 \ --with-xml2-lib=$HOME/local/lib but it still gives the error: Building native extensions. This could take a while... ERROR: Error installing nokogiri: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb checking for iconv.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for libxml/parser.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2,/usr/include,/usr/include/libxml2... yes checking for libxslt/xslt.h in /opt/local/include/,/opt/local/include/libxml2,/opt/local/include,/opt/local/include,/opt/local/include/libxml2,/usr/local/include,/usr/local/include/libxml2,/usr/include,/usr/include/libxml2,/usr/include,/usr/include/libxml2... no libxslt is missing. try 'port install libxslt' or 'yum install libxslt-devel' *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby1.8 --with-iconv-dir --without-iconv-dir --with-iconv-include --without-iconv-include=${iconv-dir}/include --with-iconv-lib --without-iconv-lib=${iconv-dir}/lib --with-xml2-dir --without-xml2-dir --with-xml2-include --without-xml2-include=${xml2-dir}/include --with-xml2-lib --without-xml2-lib=${xml2-dir}/lib --with-xslt-dir --without-xslt-dir --with-xslt-include --without-xslt-include=${xslt-dir}/include --with-xslt-lib --without-xslt-lib=${xslt-dir}/lib Gem files will remain installed in /home/myusername/.gems/gems/nokogiri-1.4.1 for inspection. Results logged to /home/myusername/.gems/gems/nokogiri-1.4.1/ext/nokogiri/gem_make.out where it doesn't seem to be looking in the paths I have specified for the libraries. Is there something wrong with my installation method?

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  • Having a white space issue with scala, I think?

    - by Uruhara747
    I'm trying to write a script to make generating Lift projects quicker but I believe i'm running into a white space issue. val strLiftGen = "mvn archetype:generate -U-DarchetypeGroupId=net.liftweb\ -DarchetypeArtifactId=lift-archetype-blank\ -DarchetypeVersion=1.0\ -DremoteRepositories=http://scala-tools.org/repo-releases-DgroupId=" + args(0)"-DartifactId=" + args(1)"-Dversion=1.0-SNAPSHOT */" Anyone care to hit the newb with the stick of wisdom and tell me a smart way of handling a long string like this?

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  • Grails Liferay portlet not invoking action

    - by RJ Regenold
    I am trying to create a simple portlet for Liferay 5.2.2 using Grails 1.2.1 with the grails-portlets 0.7 and grails-portlets-liferay 0.2 plugins. I created and deployed a stock portlet (just updated title, description, etc...). It deploys correctly and the view renders correctly. However, when I submit the default form that is in view.gsp it never hits the actionView function. Here are the relevant code bits: SearchPortlet.groovy class SearchPortlet { def title = 'Search' def description = ''' A simple search portlet. ''' def displayName = 'Search' def supports = ['text/html':['view', 'edit', 'help']] // Liferay server specific configurations def liferay_display_category = 'Category' def actionView = { println "In action view" } def renderView = { println "In render view" //TODO Define render phase. Return the map of the variables bound to the view ['mykey':'myvalue'] } ... } view.gsp <%@ taglib uri="http://java.sun.com/portlet" prefix="portlet" %> <div> <h1>View Page</h1> The map returned by renderView is passed in. Value of mykey: ${mykey} <form action="${portletResponse.createActionURL()}"> <input type="submit" value="Submit"/> </form> </div> The tomcat terminal prints In render view whenever I view the portlet, and after I press the submit button. It never prints the In action view statement. Any ideas? Update I turned on logging and this is what I see whenever I click the submit button in the portlet: [localhost].[/gportlet] - servletPath=/Search, pathInfo=/invoke, queryString=null, name=null [localhost].[/gportlet] - Path Based Include portlets.GrailsDispatcherPortlet - DispatcherPortlet with name 'Search' received render request portlets.GrailsDispatcherPortlet - Bound render request context to thread: com.liferay.portlet.RenderRequestImpl@7a158e portlets.GrailsDispatcherPortlet - Testing handler map [org.codehaus.grails.portlets.GrailsPortletHandlerMapping@1f06283] in DispatcherPortlet with name 'Search' portlets.GrailsDispatcherPortlet - Testing handler adapter [org.codehaus.grails.portlets.GrailsPortletHandlerAdapter@74f72b] portlets.GrailsPortletHandlerAdapter - portlet.handleMinimised not set, proceeding with normal render portlet.SearchPortlet - In render view portlets.GrailsPortletHandlerAdapter - Couldn't resolve action view /search/null.gsp portlets.GrailsPortletHandlerAdapter - Trying to render mode view /search/view.gsp portlets.GrailsDispatcherPortlet - Setting portlet response content type to view-determined type [text/html;charset=ISO-8859-1] [localhost].[/gportlet] - servletPath=/WEB-INF/servlet/view, pathInfo=null, queryString=null, name=null [localhost].[/gportlet] - Path Based Include portlets.GrailsDispatcherPortlet - Cleared thread-bound render request context: com.liferay.portlet.RenderRequestImpl@7a158e portlets.GrailsDispatcherPortlet - Successfully completed request The fourth line in that log snippet says Bound render request..., which I don't understand because the action in the form that is in the portlet is to the action url. I would've thought that should be an action request.

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  • Tuning MySQL to take advantage of a 4GB VPS

    - by alistair.mp
    Hello, We're running a large site at the moment which has a dedicated VPS for it's database server which is running MySQL and nothing else. At the moment all four CPU cores are running at close to 100% all of the time but the memory usage sticks at around 268MB out of an available 4096MB. I'm wondering what we can do to better utilise the memory and reduce the CPU load by tweaking MySQL's settings? Here is what we currently have in my.cnf: http://pastie.org/private/hxeji9o8n3u9up9mvtinbq Thanks

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  • Whats happening to my HTML?

    - by user156814
    I am making changes to my website, and I just noticed that things look different. In IE, the content doesnt center, theres a margin on my content, and the font looks bigger in chrome.. I ran it through Yahoo's HTML validator and the error I get is line 1 - Error: character "" not allowed in prolog. I believe that there may be some sort of whitespace being sent before the DOC TYPE, but I cant seem to fix it. The HTML looks fine in my text editor (Notepad++) so I dont know what the problem is. Im using a strict DOC Type. Everything was fine before I made any changes, but I cant pinpoint what caused the change. If it helps, I'm using a Framework (Kohana). My initial thought was that something was being sent to the browser by an echo or something, but I couldnt find any echo statements. I dont know what could be causing this... If you want to see any code or HTML just ask. Thanks. Heres the HTML (only head and doctype) via the page source in Google Chrome There seems to be some foreign characters in the source that I've never seen before, yet dont show up anywhere else (yahoo, or otherwise) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Recent Debates - Clashing Thoughts</title> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="en-us" /> <meta name="description" content="Clashing Thoughts is a great place to argue! Search topics you feel passionate about, pick where you stand on the issue and get your point across. The votes are tallied up for every debate so you can even see which side is most popular." /> <meta name="keywords" content="debates, arguments, topics, popular topics, popular debates, surveys, choices" /> <link rel="stylesheet" type="text/css" href="http://localhost/css/master.css" media="screen" /> <link rel="stylesheet" type="text/css" href="http://localhost/css/clashingthoughts.css" media="screen" /> <link rel="icon" type="image/x-icon" href="http://localhost/images/favicon.ico" /> <link rel="shortcut icon" type="image/x-icon" href="http://localhost/images/favicon.ico" /> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> </head>

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  • The current state of Perl6

    - by Cobalt
    What is the current state of Perl6, is it production-ready ? Where do we stand right now ? There are many programmers curious about the current progress of Perl6. There are also two other topics open on on reddit and perlmonks.org/?node_id=835419 about this.

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  • How to get HTTP status message in (py)curl?

    - by mykhal
    spending some time studying pycurl and libcurl documentation, i still can't find a (simple) way, how to get HTTP status message (reason-phrase) in pycurl. status code is easy: import pycurl import cStringIO curl = pycurl.Curl() buff = cStringIO.StringIO() curl.setopt(pycurl.URL, 'http://example.org') curl.setopt(pycurl.WRITEFUNCTION, buff.write) curl.perform() print "status code: %s" % curl.getinfo(pycurl.HTTP_CODE) # -> 200 # print "status message: %s" % ??? # -> "OK"

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  • Axis2 wont work in Netbeans

    - by AJ
    I am unable to get Axis2 to work on my NetBeans 6.5. I have everything that written here http://netbeans.org/kb/61/websvc/gs-axis.html I am using embedded tomcat of Netbeans. So the problem I am getting is that I can see tomcat welcome page at http://localhost:8084/ but at http://localhost:8084/axis2/ I am getting HTTP Status 404.

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