Witango-Talk: 304 last-modified
Hi All, I am a bit confused as to how to implement a caching scheme in which I can show whether or not a page has been updated or not. This is for a forum that stores the last update by date. I would like to change the response http to show the last-modified date if possible. Unfortunately, I am a novice on http headers and would like some help on how to implement this. If I set the expiry to @ASSIGN Local$httpHeader VALUE=Content-Type: text/html@CRLFCache-Control: no-cache, max-age=0, must-revalidate,proxy revalidate@CRLFPragma: no-cache@CRLF@USERREFERENCECOOKIE@CRLF Will this generat what I need for the request? I am looking for the reponse to be something like this... HTTP/1.0 200 OK Server: Microsoft-IIS/5.0 Content-Location: http://www.xyz.taf http://www.xyz.taf Date: Fri, 22 Aug 2008 18:22:39 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Wed, 020 Aug 2008 13:30:23 GMT ETag: 801395163ec21:8a9 Content-Length: 751 And I am confused as to the ETag. Can I set this globally for all tafs? or would that really take a performance hit? Can someone shed some light on this, please? Thanks! TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
Re: Witango-Talk: 304 last-modified
Hey Dude, Unfortunately HTTP caching takes a lot more consideration than just globally setting a custom HTTP response header. When you set a custom header for caching purposes, this process is entirely dependent on receiving some specific request HTTP header properties (i.e., If-Modified-Since and/or If-None-Match), in order to conditionally set a corresponding expiry date, an ETag number and a 304 response (for the subsequent responses), as opposed to the custom 200 response (on the first response). And depending on the version of tango you are running - you may not have access to these HTTP properties. In addition, HTTP caching is managed by matching the entire URL of the file in question, this includes the argument names and values, so if your GET arguments are changing, then your caching is overridden. POST requests generally always override cache checks as well. And of course it should be mentioned that although browsers and proxies do adhere to the HTTP standards, these applications and devices are sometimes unpredictable as to when they implement cache rules. I've built systems with HTTP caching, and I hope I can save you some time by giving you some advice - don't bother. The headache, unpredictability and limited results is usually not worth it. There'll be times where you can easily waste hours chasing your code in circles just to discover that all the bugs and weird behavior is the result of something happening off the server (where you have no control). I would recommend you pursue methods for caching whatever essential data you need in memory on the Server to save on performance issues - or check out load balancing. Or possibly an appliance of some kind that handles the caching outside of your server. And please note, your tango code example is for deliberately turning off caching. I hope this helps, good luck. Scott, On Aug-22-2008, at 10:55 AM, WebDude wrote: Hi All, I am a bit confused as to how to implement a caching scheme in which I can show whether or not a page has been updated or not. This is for a forum that stores the last update by date. I would like to change the response http to show the last-modified date if possible. Unfortunately, I am a novice on http headers and would like some help on how to implement this. If I set the expiry to @ASSIGN Local$httpHeader VALUE=Content-Type: text/html@CRLFCache- Control: no-cache, max-age=0, must-revalidate,proxy revalidate@CRLFPragma: no- cache@CRLF@USERREFERENCECOOKIE@CRLF Will this generat what I need for the request? I am looking for the reponse to be something like this... HTTP/1.0 200 OK Server: Microsoft-IIS/5.0 Content-Location: http://www.xyz.taf Date: Fri, 22 Aug 2008 18:22:39 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Wed, 020 Aug 2008 13:30:23 GMT ETag: 801395163ec21:8a9 Content-Length: 751 And I am confused as to the ETag. Can I set this globally for all tafs? or would that really take a performance hit? Can someone shed some light on this, please? Thanks! TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
RE: Witango-Talk: 304 last-modified
Thanks, Scott, Yeah, I thought it was going to be complicated ;-/ I actually was looking at ASP and PHP code to see if I could write something in Witango that would kind of do the same thing. I was looking at this from a Googlebot point of view. When Gbot comes, if the requested page hasn't been modified since the last request it won't crawl the page. Google recommends that you use this... You should configure your server to return this response (called the If-Modified-Since HTTP header) when a page hasn't changed since the last time the requestor asked for it. This saves you bandwidth and overhead because your server can tell Googlebot that a page hasn't changed since the last time it was crawled. 'Dude -Original Message- From: Scott Cadillac [mailto:[EMAIL PROTECTED] Sent: Friday, August 22, 2008 9:51 AM To: witango-talk@witango.com Subject: Re: Witango-Talk: 304 last-modified Hey Dude, Unfortunately HTTP caching takes a lot more consideration than just globally setting a custom HTTP response header. When you set a custom header for caching purposes, this process is entirely dependent on receiving some specific request HTTP header properties (i.e., If-Modified-Since and/or If-None-Match), in order to conditionally set a corresponding expiry date, an ETag number and a 304 response (for the subsequent responses), as opposed to the custom 200 response (on the first response). And depending on the version of tango you are running - you may not have access to these HTTP properties. In addition, HTTP caching is managed by matching the entire URL of the file in question, this includes the argument names and values, so if your GET arguments are changing, then your caching is overridden. POST requests generally always override cache checks as well. And of course it should be mentioned that although browsers and proxies do adhere to the HTTP standards, these applications and devices are sometimes unpredictable as to when they implement cache rules. I've built systems with HTTP caching, and I hope I can save you some time by giving you some advice - don't bother. The headache, unpredictability and limited results is usually not worth it. There'll be times where you can easily waste hours chasing your code in circles just to discover that all the bugs and weird behavior is the result of something happening off the server (where you have no control). I would recommend you pursue methods for caching whatever essential data you need in memory on the Server to save on performance issues - or check out load balancing. Or possibly an appliance of some kind that handles the caching outside of your server. And please note, your tango code example is for deliberately turning off caching. I hope this helps, good luck. Scott, On Aug-22-2008, at 10:55 AM, WebDude wrote: Hi All, I am a bit confused as to how to implement a caching scheme in which I can show whether or not a page has been updated or not. This is for a forum that stores the last update by date. I would like to change the response http to show the last-modified date if possible. Unfortunately, I am a novice on http headers and would like some help on how to implement this. If I set the expiry to @ASSIGN Local$httpHeader VALUE=Content-Type: text/html@CRLFCache- Control: no-cache, max-age=0, must-revalidate,proxy revalidate@CRLFPragma: no- cache@CRLF@USERREFERENCECOOKIE@CRLF Will this generat what I need for the request? I am looking for the reponse to be something like this... HTTP/1.0 200 OK Server: Microsoft-IIS/5.0 Content-Location: http://www.xyz.taf Date: Fri, 22 Aug 2008 18:22:39 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Wed, 020 Aug 2008 13:30:23 GMT ETag: 801395163ec21:8a9 Content-Length: 751 And I am confused as to the ETag. Can I set this globally for all tafs? or would that really take a performance hit? Can someone shed some light on this, please? Thanks! __ __ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
Witango-Talk: New project and Sick Member
1st, Ben Johanson has been working for me for a couple of years now, and he has worked with me hard on one particular project. Not related, but he is having some serious digestive issues and isn't doing well, in the ER at the moment, so if you know him, you may want to wish him well. I am sure he would appreciate it. BigHead's last major witango site, and by far biggest work in terms of scope and use is peachdirect.com. http://www.peachdirect.com/ This system was not only a very sophisticated ecommerce site, basically a mini bestbuy type site, but also we wrote the entire backend, including all vendor fullfillment, vendor communication, and since this is a private credit card site, we wrote all of the communication modules custom for communicating to the bank. Its a very large system. The site was written in witango, and then uses other languages, mainly realbasic to deal with the bank com and the vendor system and such. The peachdirect site is almost dormant now, but at its peak was doing over $20 million per month in orders. At its peak, witango could barely take it, we had lots of workarounds, and even wrote our own page caching system in witango to help with the load. Originally, several years ago, the witango site was only supposed to be up for a few months, until they went to a bigger system. Well, the company has completely changed their name and launched a new site/system and are planning the $20 million/month level in just a couple of months. This time, we wrote the ENTIRE system in PHP and it is running on the Zend Platform. We have already ported large sites over from witango to php, but this was a monster. The interesting part is that every line of code is written in PHP. There is no perl, realbasic, java, nothing. Not only that, we are using standard PHP 5.1.6 from CentOS 5.2 distribution, with yum installable modules, like php-gd, php-xml, php-soap, etc. No pear, no roll your own stuff at all. We have used a couple of classes to generate excel files, and things like that, other than that, its all standard php, with the addition of some features like partial page caching from the Zend Platform. In this huge project, I don't think we have run into ONE php bug. I can't think of a time we had to rewrite code, or create an external object to make up for a php bug or deficiency. Even all of the realbasic code that handled the bank and vendor communication is written in PHP, some scripts being run from command line via cron and such. Anyway, I am not trying to sell php, I have no gain there, but as a developer I am amazed. To make the statement that we have not had one workaround, is amazing. XML just works, soap just works. The soap client is amazing, just give it a wsdl and call your method, like 3 lines of code. Many have contacted me if possible to port big projects over, yes it is. Anyway, just thought I would share, don't forget to shoot ben a line if you know him. Link to new site: http://www.venue.com/ -- Robert Garcia President - BigHead Technology VP Application Development - eventpix.com 13653 West Park Dr Magalia, Ca 95954 ph: 530.645.4040 x222 fax: 530.645.4040 [EMAIL PROTECTED] - [EMAIL PROTECTED] http://bighead.net/ - http://eventpix.com/ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
RE: Witango-Talk: New project and Sick Member
Robert, Thanks for the heads up on Ben. Although I've never met Ben in person, Ben has always been a help to me with Tango and Witango over the years. I've sent him a brief note. Hope all is well with him. Tom Ferguson -Original Message- From: Robert Garcia [mailto:[EMAIL PROTECTED] Sent: Friday, August 22, 2008 08:41 To: witango-talk@witango.com Subject: Witango-Talk: New project and Sick Member 1st, Ben Johanson has been working for me for a couple of years now, and he has worked with me hard on one particular project. Not related, but he is having some serious digestive issues and isn't doing well, in the ER at the moment, so if you know him, you may want to wish him well. I am sure he would appreciate it. BigHead's last major witango site, and by far biggest work in terms of scope and use is peachdirect.com. http://www.peachdirect.com/ This system was not only a very sophisticated ecommerce site, basically a mini bestbuy type site, but also we wrote the entire backend, including all vendor fullfillment, vendor communication, and since this is a private credit card site, we wrote all of the communication modules custom for communicating to the bank. Its a very large system. The site was written in witango, and then uses other languages, mainly realbasic to deal with the bank com and the vendor system and such. The peachdirect site is almost dormant now, but at its peak was doing over $20 million per month in orders. At its peak, witango could barely take it, we had lots of workarounds, and even wrote our own page caching system in witango to help with the load. Originally, several years ago, the witango site was only supposed to be up for a few months, until they went to a bigger system. Well, the company has completely changed their name and launched a new site/system and are planning the $20 million/month level in just a couple of months. This time, we wrote the ENTIRE system in PHP and it is running on the Zend Platform. We have already ported large sites over from witango to php, but this was a monster. The interesting part is that every line of code is written in PHP. There is no perl, realbasic, java, nothing. Not only that, we are using standard PHP 5.1.6 from CentOS 5.2 distribution, with yum installable modules, like php-gd, php-xml, php-soap, etc. No pear, no roll your own stuff at all. We have used a couple of classes to generate excel files, and things like that, other than that, its all standard php, with the addition of some features like partial page caching from the Zend Platform. In this huge project, I don't think we have run into ONE php bug. I can't think of a time we had to rewrite code, or create an external object to make up for a php bug or deficiency. Even all of the realbasic code that handled the bank and vendor communication is written in PHP, some scripts being run from command line via cron and such. Anyway, I am not trying to sell php, I have no gain there, but as a developer I am amazed. To make the statement that we have not had one workaround, is amazing. XML just works, soap just works. The soap client is amazing, just give it a wsdl and call your method, like 3 lines of code. Many have contacted me if possible to port big projects over, yes it is. Anyway, just thought I would share, don't forget to shoot ben a line if you know him. Link to new site: http://www.venue.com/ -- Robert Garcia President - BigHead Technology VP Application Development - eventpix.com 13653 West Park Dr Magalia, Ca 95954 ph: 530.645.4040 x222 fax: 530.645.4040 [EMAIL PROTECTED] - [EMAIL PROTECTED] http://bighead.net/ - http://eventpix.com/ __ __ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
