URL u_port should be a number not a string.

The idea here is to reduce the dynamic allocations used for
URLs, and also the back and forth with parsing begin strings
and port numbers.  We always resolve to a port number, and
this is easier for everyone.

The real goal in the long term is to eliminate dynamic allocation
of the URL fields altogether, but that requires a little more
work.  This is a step in the right direction.

1 files changed, 7 insertions, 0 deletions

diff --git a/docs/ref/migrate/nng1.md b/docs/ref/migrate/nng1.md
index d3440fe4..b7ddea33 100644
--- a/docs/ref/migrate/nng1.md
+++ b/docs/ref/migrate/nng1.md
@@ -160,4 +160,11 @@ A number of the [statistics][statistic] functions take, or return, `const nng_st
 of plain `nng_stat *`. The ABI has not changed, but it may be necessary to declare
 certain methods variables `const` to avoid warnings about misuse of `const`.
 
+## Url Structure Members
+
+The details of [`nng_url`] have changed as follows:
+
+- `u_port` is no longer a string, but a `uint16_t`
+- `u_scheme` is a const char \*
+
 {{#include ../xref.md}}