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:
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:
but there are no similar pages for ajp 1.4 - see:
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 articlesA608 - Web Application Deployment - Apache httpd mod_proxy 
Distributed, Balanced and Clustered Load Sharing - the difference - (2012-10-13) 
How can I run multiple web servers behind a single IP address? - (2012-04-02) 
Simplest ever proxy configuration? - (2011-06-28) 
Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18) 
Load balancing with sticky sessions (httpd / Tomcat) - (2009-10-29) 
Apache, Tomcat, mod_proxy - (2009-08-06) 
Virtual hosting and mod_proxy forwarding of different domains (httpd) - (2009-03-01) 
Forwarding session and cookie requests from httpd to Tomcat - (2008-12-14) 
mod_proxy_ajp and mod_proxy_balancer examples - (2008-12-13) 
mod_proxy and mod_proxy_ajp - httpd - (2008-08-22) 
Strange behaviour of web directory requests without a trailing slash - (2008-03-06) 
Choosing between mod_proxy and mod_rewrite - (2007-10-02) 
Sharing the load with Apache httpd and perhaps Tomcat - (2007-03-29) 
Apache httpd and Apache Tomcat together tips - (2006-12-24) 
Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21) 
Apache httpd to Tomcat - jk v proxy - (2006-03-03)
Some other Articles
Python classes / courses - what version do we train on?Who is Marc Schneider of Multilingual Search Engine Optimization IncDebugging multipage (session based) PHP applicationsPHP preg functions - examples and comparisionThree recent questions on Tomcat ConvertorsMonitoring and loading tools for testing Apache TomcatDogs Trust, Dog Show, NewburyWiltshire - a chance to improve life for everybodySipping at YorkWestbury Bypass Refused - looking forward
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