I wrote:
I mean, I know that I need to get HTTPAPI and Tomcat speaking the
same language, but where do I begin?

Christopher Schultz (Tomcat List) wrote:
First, I would check to see what Tomcat is actually advertising.
There are several ways to do that. One of them is to use Qualys's
SSLLabs server test:

https://www.ssllabs.com/ssltest/

Thanks, Mr. Schultz. That gives me a start.

Ok, here's what I got back.
Protocols
TLS 1.3         No
TLS 1.2         Yes
TLS 1.1         Yes
TLS 1.0         Yes
SSL 3   No
SSL 2   No

Cipher Suites
# TLS 1.2 (server has no preference)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  128
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS       128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  256
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS       256
# TLS 1.1 (server has no preference)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  256
# TLS 1.0 (server has no preference)
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   ECDH secp521r1 (eq. 15360 bits 
RSA)   FS  256

I may have known how to determine what HTTPAPI supports, but if so, I've forgotten. Ditto for adding protocols to Tomcat.

As to the client end, it's using HTTPAPI 1.24, running on an AS/400 that's at V6R1.

--
JHHL

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