Handling SSE (Server-Sent Events) Streaming Responses in A2A Protocol Communication

[qiankunli]

In our project, assuming the Q&A chain is: user/browser ==> main agent ==a2a==> agent_a + agent_b, the output from agent_a or agent_b is often not plain text, but rather SSE-formatted streaming output similar to the following data, where the browser renders the response results according to an agreed-upon format:

{event: start, conversation_id: xx}
{event: header1, content="introduction"}
{event: message, content: "hello"}
{event: message, content: "world"}
{event: error, content="xx"}
{event: end}

For example, if the above data is the response from agent_a, how should this be handled when returning from agent_a to the main agent through the A2A protocol, so that the main agent can forward it back to the browser in the same format?