# a!httpQuery Is there any way to pass a specific TLS version say 1.2, in t

That is correct as headers are a part of the HTTP traffic and not a part of the SSL handshake that takes place before any HTTP traffic is initiated.
The SSL handshake will try and use the highest TLS/SSL version available on both servers.
You must enable each other version of TLS you wish to also use as otherwise any services that implement a lower TLS version will not be able to connect with you as they will not see you supporting lower versions.
You can contact any web service administrators for services you may be implementing to ask if they can enable TLS v1.2 as I would think any security recommendations and updates are always a welcome request from customers/end users. Then they may be able to implement this and get your service calls to use TLS v1.2.

That is correct as headers are a part of the HTTP traffic and not a part of the SSL handshake that takes place before any HTTP traffic is initiated.
The SSL handshake will try and use the highest TLS/SSL version available on both servers.
You must enable each other version of TLS you wish to also use as otherwise any services that implement a lower TLS version will not be able to connect with you as they will not see you supporting lower versions.
You can contact any web service administrators for services you may be implementing to ask if they can enable TLS v1.2 as I would think any security recommendations and updates are always a welcome request from customers/end users. Then they may be able to implement this and get your service calls to use TLS v1.2.