TSP Client fails on `Content-Type: application/json; charset=utf-8`

[JonatanAntoni]

Bug Description:

The current implementation of TSP Client (REST Client) does not accept server replies using Content-Type: application/json; charset=utf-8 as per RFC9110 8.3.2 Charset.

The problem is the strict-equal in

tsp-typescript-client/tsp-typescript-client/src/protocol/rest-client.ts

Line 125 in 75cc633

if (response.headers?.get('Content-Type') === 'application/json') {

Steps to Reproduce:

1. Connect to a TSP Server that replies with Content-Type: application/json; charset=utf-8
2. See reply to initial GET /tsp/api/health to be dismissed due to Content-Type
3. No further requests are being issued

Additional Information

• Operating System: MacOS 26