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XT*7.3*10002: Optimized HTTP[S] Transport for GT.M/YDB and Cache
Please use this identifier to cite or link to this publication: http://hdl.handle.net/10909/11386
Submitted by Samuel Habiel on 12-10-2018.
This patch provides optimized HTTPS transport for VistA. It does that by
using the libcurl binding for GT.M/YDB (https://github.com/shabiel/fis-gtm-plugins/tree/master/libcurl)
or using the %Net.HttpRequest Cache Class to perform HTTP communication.

This package does not alter the API distributed in VistA; but adds two helper
APIs. It's just a single API: $$GETURL^XTHC10. This API is documented in the VA
manual on the VDL (https://www.va.gov/vdl/documents/Infrastructure/Kernel/krn8_0dg.pdf)
as well as on the hardhats.org website (http://hardhats.org/kernel/html/x-geturl%5Exthc10.shtml).

The original code was written with the idea that a connection would be opened
and then closed for each API call. That is very expensive to do, especially when
TLS is involved, as every call will need to perform TLS negotiation again. While
this mode is still supported, you now have the option to keep the connection
option for multiple HTTP requests. To do that, you need to call D INIT^XTHC10(0),
then call $$GETURL^XTCH10 multiple times. Once you are done doing all your
calls, call D CLEANUP^XTHC10.

Reviews (Phase: Complete)

Peer review by Joe Snyder:

Topic Completed
Compliant - Product Build Checklist
Compliant - Installation and Post-Installation
Functional - Before Patch Installation
Functional - Installation and Post-Installation
Safe - Installation and Post-Installation

Final review by Joe Snyder:

Topic Level Comments
Name/Number Space
Dependency/SAC
Open Source License
Documentation
Code Review
Test Installation
Regression Testing
Functional Testing

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