🍓 0.283.1

Fixed multipart subscription header parsing to properly handle optional boundary parameters and quoted subscription spec values. This improves compatibility with different GraphQL clients that may send headers in various formats.

Key improvements:

• Made the boundary=graphql parameter optional in multipart subscription detection
• Added proper quote stripping for subscriptionSpec values (e.g., subscriptionSpec="1.0")
• Enhanced test coverage for different header format scenarios

Example of supported headers:

Accept: multipart/mixed;boundary=graphql;subscriptionSpec=1.0,application/json
Accept: multipart/mixed;subscriptionSpec="1.0",application/json

Releases contributed by @LouisAmon via #4002