[Bug]: Incorrect Json Escape

[Wesley273]

What happened?

Here, the input has been escaped.

private A2AHttpClient.PostBuilder createPostBuilder(String url, PayloadAndHeaders payloadAndHeaders) throws JsonProcessingException, InvalidProtocolBufferException {
log.fine(JsonFormat.printer().print((MessageOrBuilder)payloadAndHeaders.getPayload()));
A2AHttpClient.PostBuilder postBuilder = ((A2AHttpClient.PostBuilder)((A2AHttpClient.PostBuilder)this.httpClient.createPost().url(url)).addHeader("Content-Type", "application/json")).body(JsonFormat.printer().print((MessageOrBuilder)payloadAndHeaders.getPayload()));
if (payloadAndHeaders.getHeaders() != null) {
for(Map.Entry<String, String> entry : payloadAndHeaders.getHeaders().entrySet()) {
postBuilder.addHeader((String)entry.getKey(), (String)entry.getValue());
}
}

    return postBuilder;
}

Some input, for example:

订阅指令\n请根据以下 <事件主题>、<订阅条件>、<上报事件数据格式> 及 <预期输出> 信息

HTML Symbols will be escaped, And it is very difficult to return to normal.

订阅指令\n请根据以下 \u003c事件主题\u003e、\u003c订阅条件\u003e、\u003c上报事件数据格式\u003e 及 \u003c预期输出\u003e 信息

Relevant log output

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