Server sent events - Saba-sports/OddsDirectAPI GitHub Wiki

Keep alive

Means this user connected success, and will send KEEPALIVE every five seconds, which means it is still connected.

status	message	Description
0	Success	Connect success and continue to get the updated data.
1	InitialData	First time to connect and get initial data.
3	Reset	Reset connection.
97	Invalid Accept-Encoding	Http Status Code = 400 The encoding compression format is invalid.
98	Invalid OData query attributes	Http Status Code = 400 The Odata query attributes are invalid or not support.
99	System under maintenance	Http Status Code = 503 System is under maintenance.
100	Internal Server Error	Http Status Code = 500 The server encountered an unexpected condition that prevented it from fulfilling the request.

It will return status 1 when the first time to connect, and the initial data will be in the add class. When the message of status 1 is obtained, the front-end display should be re-rendered using the add data of the message; the updated data with status=0 will continue to be received in add/change/remove classes.
If the user disconnects due to the network or other issue:
- If using browser native javascript EventSource api, without closing the page, the browser will auto-reconnect and add Last-Event-Id in the header. Server will base on the Last-Event-Id and resend the missing data to client.
- If using other languages or frameworks, need to create the reconnection mechanism and add Last-Event-Id into the header by themselves.
- If cannot find the Last-Event-Id, it will reset the connection by status 3, and the data is initial data, the front-end display should be re-rendered using the add data of the message.