vertx / io.vertx.reactivex.core.http / HttpClientRequest / sendHead

# sendHead

`open fun sendHead(): HttpClientRequest`

Forces the head of the request to be written before `io.vertx.reactivex.core.http.HttpClientRequest#end` is called on the request or any data is written to it.

This is normally used to implement HTTP 100-continue handling, see for more information.

Return
a reference to this, so the API can be used fluently

`open fun sendHead(completionHandler: Handler<HttpVersion>): HttpClientRequest`

Like `io.vertx.reactivex.core.http.HttpClientRequest#sendHead` but with an handler after headers have been sent. The handler will be called with the io.vertx.reactivex.core.http.HttpVersion if it can be determined or null otherwise.

### Parameters

`completionHandler` -

Return