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• Is it really a security problem to have non secure assets on an ssl page?

  - by blockhead

  My understanding is that this is just an example of being overly cautious, but if my checkout form contains an unsecure asset on it, that doesn't endanger anybody's credit card numbers from being caught by a man-in-the-middle. I'm asking this because every once in while, maybe because of cached content or whatnot, somebody writes in saying that they are seeing this "error" (even though there are no unsecure assets on my page), but they want an explanation. So yes, I can tell all about encryption and certificates and trust and men-in-the-middle. But what do I tell them about this. How do I convince them that the site is 100% safe (and if it isn't let me know that I'm mistaken!)

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• I need help debugging apache with gdb (no debugging symbols found)

  - by blockhead

  I'm trying to debug a segfault in PHP/Apache running on RHEL4. This is a production server, so I'm trying to install a separate copy of apache and php, and run apache through gdb. When I load httpd through gdb and then do run -X, I get the error (no debugging symbols found)...Error while reading shared library symbols: Dwarf Error: Cannot handle DW_FORM_strp in DWARF reader. The Apache manual says something about setting EXTRA_CFLAGS to "-g", and i've tried configuring with --enable-maintainer-mode, but I don't seem to be getting far.

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• How do I generate a core dump from apache

  - by blockhead

  I have a script which intermittently returns a white screen of death in firefox and Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error. chrome. When I try to access the script using a PHP HTTP client (like Zend_Http_Client), intermittently I get an exception (sorry I don't have the exact message on me at the moment). I suspect a segfault. This is further buttressed by the lines in my error log that look like this: [Thu Mar 18 16:03:02 2010] [notice] child pid 845 exit signal Segmentation fault (11) Now, I'm running RedHat, and I know that RedHat doesn't generate core dumps out-of-the-box. I followed the instructions here http://kbase.redhat.com/faq/docs/DOC-5353, but I'm not seeing any core dumps. How do I generate a core dump?

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• Cannot find grldr in all devices

  - by blockhead

  I'm running wubi on XP machine. Started out originally with 8.04, and gradually upgraded to 10.04. Recently, I was creating linux bootable USB drive, and put it in my system to see if it would work. After booting the LiveOS, and rebooting my machine, I know get the error Cannot find grldr in all devices when booting Ubuntu. I don't know what grldr is, but I assume it is the GRUB Loader. Did booting the LiveOS screw with my MBR perhaps? How can I fix this, and if not, is it possible to reinstall wubi, without losing anything of what I have now?

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• Need help generating a core dump from apache segfault

  - by blockhead

  I have a script which intermittently returns a white screen of death in firefox and Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error. chrome. When I try to access the script using a PHP HTTP client (like Zend_Http_Client), intermittently I get an exception (sorry I don't have the exact message on me at the moment). I suspect a segfault. This is further buttressed by the lines in my error log that look like this: [Thu Mar 18 16:03:02 2010] [notice] child pid 845 exit signal Segmentation fault (11) Now, I'm running RedHat, and I know that RedHat doesn't generate core dumps out-of-the-box. I followed the instructions here http://kbase.redhat.com/faq/docs/DOC-5353, but I'm not seeing any core dumps. How do I generate a core dump?

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• Cheapest way to go for somebody who wants to accept payments, but won't be accepting hundreds of ord

  - by blockhead

  I have a client who lectures, and wants to sell spots to his lecture online. I would preferably like to set him up with a solution that allows me to collect billing information on his site. My experience with e-commerce is in using solutions like Authorize.net, however this does not seem cost effective since I can't imagine he's making a huge profit off of this. I'm afraid he would lose money in the cost of using Authorize.net (or any payment gateway for the matter). I could use google checkout or paypal express, but this would require me to leave his site (although with google checkout, it looks like, from a glance, that I could just submit to their form from my server, and likely with paypal as well, but I don't know if this is against their TOS). What is the most cost-effective solution for accepting credit card payments in this situation?

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• I upgraded to ubuntu lucid and now flash won't work in chrome

  - by blockhead

  I just upgraded to lucid, and now flash won't work in chrome (though it works in firefox). I even switched over to the dev channel, which supposedly has flash built in, but it still doesn't work.

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• What benefit do I get from using a 64-bit server?

  - by blockhead

  I bought a small 256MB slice from slicehost and installed Ubuntu 10.04 64bit and wordpress on it. Performance was dismal as apache was eating up all my memory. Once I did some taming of apache and switched to fCGI things ran fine. Next I rebuilt as a 32 bit server, and performance was much better. What benefit would I get from a 64 bit server. Is it all about the memory?

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• Nautilus cannot handle "sftp" locations via x11

  - by blockhead

  I'm logging into my home computer (Ubuntu 10.04) via ssh, and now I want to open a remote connection (one that is stored in my bookmarks). Nautilus tells me "Nautilus cannot handle "sftp" locations via x11". Why might this be?

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• Cannot find grldr in all devices

  - by blockhead

  I'm running wubi on XP machine. Started out originally with 8.04, and gradually upgraded to 10.04. Recently, I was creating linux bootable USB drive, and put it in my system to see if it would work. After booting the LiveOS, and rebooting my machine, I know get the error Cannot find grldr in all devices when booting Ubuntu. I don't know what grldr is, but I assume it is the GRUB Loader. Did booting the LiveOS screw with my MBR perhaps? How can I fix this, and if not, is it possible to reinstall wubi, without losing anything of what I have now?

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• What is a good way to set up a dev, staging and production workflow with wordpress

  - by blockhead

  Wordpress presents some challenges since it tends to keep too much in the database, making it hard to move from server to server. What are some other issues to look out for? What was your workflow like?

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• Just quick: How do you call a mutator from within a constructor in the same class?

  - by Blockhead

  For a homework assignment the instructions state (within Undergrad class): You do NOT need to include a default constructor, but you must write a full parameterized constructor (it takes 4 arguments) -- this constructor calls the parent class parameterized constructor and the mutator for year level. Because Undergrad extends Student, then Student is my parent class, right? I just can't quite figure out how I'm to use my year level mutator (which is just the simplest of methods) to assign my "year" attribute. public void setYear(int inYear) { year = inYear; } public Student(String inName, String inID, int inCredits) { name = inName; id = inID; credits = inCredits; } public Undergrad(String inName, String inID, int inCredits,int inYear) { super(inName, inID, inCredits); year = inYear; } I keep missing assignments because I spend too much time on these small specific points of the homework so just asking for a little help. I swear it's the wording that throws me off on these assignments almost as often as just learning the material itself.

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• Does it make sense to commit after every save with a DVCS?

  - by blockhead

  I know the question has been asked before how often to commit with a DVCS. All answers have one thing in common--as often as possible. But they're usually something like, after finishing a thought, a user story, getting code that compiles, or passing tests. I was thinking, given that a DVCS gives you you're own repository, with very cheap commits, doesn't it make sense, to commit after every change to a file? After all, this is what happens in NetBeans, and you get a nice free "time machine" without even asking for it. If not every change, then at least every save, or compile. Does this make sense, or do I have the wrong idea about DVCS. My feeling is that this not the workflow most people have with DVCS.

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• msxml domdocument stops working when I move to staging server

  - by blockhead

  I have some code that looks like this: Set xmlHttp = Server.CreateObject("MSXML2.ServerXMLHTTP") xmlHttp.Open "Get", myRSSfile, false xmlHttp.Send() myXML = xmlHttp.ResponseText Set xmlResponse = Server.CreateObject("MSXML2.DomDocument") xmlResponse.async = false xmlResponse.LoadXml(myXML) Set xmlHttp = Nothing Set objLst = xmlResponse.getElementsByTagName("item") Set xmlResponse = Nothing NoOfHeadlines = objLst.length - 1 Response.Write NoOfHeadlines This worked find on my development server. When I moved it over to a staging server (which I have no control over, and no nothing about), NoOfHeadlines returns 0. It seems obvious to me that DomDocument is not working the way its supposed to. Is this a version issue? How do I find out what version of DomDocument is on the staging server? Is there another possibility?

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• selecting when an aggregate column has two or more items

  - by blockhead

  Let's say I had a query like this: SELECT * FROM ( SELECT 'a' AS a, '1' AS b UNION SELECT 'a' AS a, '2' AS b UNION SELECT 'b' AS a, '1' AS b) AS a GROUP BY a.a In this case "a".b is an aggregate of 1,2 while "b".b is only an aggregate of 1. How can I select only "a"?

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• Cheapest way to go for somebody who wants to accept payments, but won't be accepting hundreds of ord

  - by blockhead

  I have a client who lectures, and wants to sell spots to his lecture online. I would preferably like to set him up with a solution that allows me to collect billing information on his site. My experience with e-commerce is in using solutions like Authorize.net, however this does not seem cost effective since I can't imagine he's making a huge profit off of this. I'm afraid he would lose money in the cost of using Authorize.net (or any payment gateway for the matter). I could use google checkout or paypal express, but this would require me to leave his site (although with google checkout, it looks like, from a glance, that I could just submit to their form from my server, and likely with paypal as well, but I don't know if this is against their TOS). What is the most cost-effective solution for accepting credit card payments in this situation?

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• Zend_Form and Liskov Substitution Principle

  - by blockhead

  A very common pattern I see (I'm picking on Zend Framework, only because I was dealing with it at the moment of this question), is something like this: class My_Form extends Zend_Form { public function init() { $this->addElement(); } } Zend_Form is not an abstract class, but is perfectly usable on its own. This seems to be "recommended" as place to "encapsulate" your forms into a nice class. Does this violate the Liskov Substitution Principle? Each subclass of Zend_Form will have a wildy different behavior than the base class. Would it be better to use composition for this, or am I totally misunderstanding this principle?

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