If I were to send out a HTTP GET request to e.g. the Shodan REST streaming API, is this implemented on the server side by periodically sending out HTTP Keep-Alive messages to the client in case there is no new data to be sent out? Or are there other options/techniques available for implementing REST streaming API endpoints?

CodePudding user response：

There is no such thing as an http keepalive message.

The API you link to simply doesn't tell the client in advance how long the response body is, so a client can keep reading the newline-separated messages from what counts as one response until either side decides they're done.