ne_set_request_expect100
3

# ne_set_request_expect100

function to enable Expect: 100-continue support

          #include <ne_request.h>

            void ne_set_request_expect100
            ne_request *request
            int flag

## Description

An extension introduced in the HTTP/1.1 specification was the use of the `Expect: 100-continue` header. This header allows an HTTP client to be informed of the expected response status before the request message body is sent: a useful optimisation for situations where a large message body is to be sent. The `ne_set_request_expect100` function can be used to enable this feature by passing the `flag` parameter as any non-zero integer.

Unfortunately, if this header is sent to a server which is not fully compliant with the HTTP/1.1 specification, a deadlock occurs resulting in a temporarily "hung" connection. neon will recover gracefully from this situation, but only after a 15 second timeout. It is highly recommended that this option is not enabled unless it is known that the server in use correctly implements `Expect: 100-continue` support.

## See also

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