docs: expanded on some CURLU details

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CURLU, void *pointer);

.SH DESCRIPTION

Pass in a pointer to the \fIURL\fP to work with. The parameter should be a

CURLU *. Setting \fICURLOPT_CURLU(3)\fP will explicitly override \fICURLOPT_URL(3)\fP.

CURLU *. Setting \fICURLOPT_CURLU(3)\fP will explicitly override

\fICURLOPT_URL(3)\fP.

\fICURLOPT_URL(3)\fP or \fICURLOPT_CURLU(3)\fP \fBmust\fP be set before a

transfer is started.

libcurl will use this handle and its contents read-only and will not change

its contents. An application can very well update the contents of the URL

handle after a transfer is done and if the same handle is then used in a

subsequest request the updated contents will then be used.

.SH DEFAULT

The default value of this parameter is NULL.

.SH PROTOCOLS

support. That may be useful if you accept the URL from an external source and

want to limit the accessibility.

\fICURLOPT_URL(3)\fP is the only option that \fBmust\fP be set before a

The \fICURLOPT_URL(3)\fP string will be ignored if \fICURLOPT_CURLU(3)\fP is

set.

\fICURLOPT_URL(3)\fP or \fICURLOPT_CURLU(3)\fP \fBmust\fP be set before a

transfer is started.

The host part of the URL contains the address of the server that you want to

.BR CURLOPT_VERBOSE "(3), " CURLOPT_PROTOCOLS "(3), "

.BR CURLOPT_FORBID_REUSE "(3), " CURLOPT_FRESH_CONNECT "(3), "

.BR curl_easy_perform "(3), "

.BR CURLINFO_REDIRECT_URL "(3), " CURLOPT_PATH_AS_IS "(3), "

.BR CURLINFO_REDIRECT_URL "(3), " CURLOPT_PATH_AS_IS "(3), " CURLOPT_CURLU "(3), "