HTTP_SENDFIELD(3) libdill Library Functions HTTP_SENDFIELD(3) NAME http_sendfield - sends HTTP field to the peer SYNOPSIS #include <libdill.h> int http_sendfield( int s, const char* name, const char* value, int64_t deadline); DESCRIPTION WARNING: This is experimental functionality and the API may change in the future. HTTP is an application-level protocol described in RFC 7230. This imple- mentation handles only the request/response exchange. Whatever comes after that must be handled by a different protocol. This function sends an HTTP field, i.e. a name/value pair, to the peer. For example, if name is Host and resource is www.example.org the line sent will look like this: Host: www.example.org After sending the last field of HTTP request don't forget to call http_done on the socket. It will send an empty line to the server to let it know that the request is finished and it should start processing it. s: HTTP socket handle. name: Name of the field. value: Value of the field. deadline: A point in time when the operation should time out, in millisec- onds. Use the now function to get your current point in time. 0 means im- mediate timeout, i.e., perform the operation if possible or return without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed. This function is not available if libdill is compiled with --disable-sock- ets option. RETURN VALUE In case of success the function returns 0. In case of error it returns -1 and sets errno to one of the values below. ERRORS * EBADF: Invalid handle. * ECANCELED: Current coroutine was canceled. * ECONNRESET: Broken connection. * EINVAL: Invalid argument. * ENOTSUP: The handle does not support this operation. * ETIMEDOUT: Deadline was reached. EXAMPLE int s = tcp_connect(&addr, -1); s = http_attach(s); http_sendrequest(s, "GET", "/", -1); http_sendfield(s, "Host", "www.example.org", -1); http_done(s, -1); char reason[256]; http_recvstatus(s, reason, sizeof(reason), -1); while(1) { char name[256]; char value[256]; int rc = http_recvfield(s, name, sizeof(name), value, sizeof(value), -1); if(rc == -1 && errno == EPIPE) break; } s = http_detach(s, -1); tcp_close(s); SEE ALSO http_attach(3) http_attach_mem(3) http_detach(3) http_done(3) http_recv- field(3) http_recvrequest(3) http_recvstatus(3) http_sendrequest(3) http_sendstatus(3) now(3) libdill HTTP_SENDFIELD(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO
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