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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Three recent questions on Tomcat Convertors

Can mod_proxy receive a request in one protocol and forward it in another?

mod_proxy (in httpd 2.2.x at least) is capable of protocol conversion - at least from http to ajp. https to http, and https to ajp should also work. mod_proxy_connect provides the capability of onward connection via https according to the manual. It is not a facility I have used personally, as the requirement for a secure connection between two local machines on the same subnet is not common when compared to external secure connections. See:
http://httpd.apache.org/docs/2.2/mod/mod_proxy.html

What is ajp 1.4 protocol?

I have taken a look at "ajp 1.4 protocol". The commonly used protocol / current standard is 1.3, but there are a (very few references around to 1.4. As an educated guess, the 1.4 proposal which included some sort of negotiated content system, was dropped.

The Tomcat project page includes details of the ajp 1.3 protocol:
http://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html
but there are no similar pages for ajp 1.4 - see:
http://tomcat.apache.org/connectors-doc/


What is the "accept count" on a connector, what is its default value, and what should I set it to?

According to the documentation, the default acceptcount (the number of connections that can be help waiting in a queue) is 10. Usual recommendation is that the acceptCount be set to the same value as the maximum connections to allow for there to be one connection waiting for each one being processed, although with the throttling at the httpd rather than the tomcat level in most installations, this could be a moot point.
(written 2009-07-07)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A608 - Web Application Deployment - Apache httpd mod_proxy
  [631] Apache httpd to Tomcat - jk v proxy - (2006-03-03)
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [1121] Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29)
  [1376] Choosing between mod_proxy and mod_rewrite - (2007-10-02)
  [1566] Strange behaviour of web directory requests without a trailing slash - (2008-03-06)
  [1767] mod_proxy and mod_proxy_ajp - httpd - (2008-08-22)
  [1939] mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13)
  [1944] Forwarding session and cookie requests from httpd to Tomcat - (2008-12-14)
  [2062] Virtual hosting and mod_proxy forwarding of different domains (httpd) - (2009-03-01)
  [2325] Apache, Tomcat, mod_proxy - (2009-08-06)
  [2482] Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29)
  [3293] Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18)
  [3339] Simplest ever proxy configuration? - (2011-06-28)
  [3680] How can I run multiple web servers behind a single IP address? - (2012-04-02)
  [3892] Distributed, Balanced and Clustered Load Sharing - the difference - (2012-10-13)


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PHP preg functions - examples and comparision
Three recent questions on Tomcat Convertors
Monitoring and loading tools for testing Apache Tomcat
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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