Rust/rusty: Add a couple of convenience functions

This adds the following convenience functions for adding HTTP response
headers, Content-Type & Content-length

  uwr_http_add_header_content_type(ctx: *mut luw_ctx_t, ctype: &str);
  uwr_http_add_header_content_len(ctx: *mut luw_ctx_t);

These are perhaps the two most common headers so it makes sense to
reduce the effort to adding them.

E.g before

  uwr_http_add_header(&ctx, "Content-Type", "text/plain");
  uwr_http_add_header(
      ctx,
      "Content-Length",
      &format!("{}", uwr_get_response_data_size(ctx)),
  );

after

  uwr_http_add_header_content_type(ctx, "text/plain");
  uwr_http_add_header_content_len(ctx);

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/API-Rust.md b/API-Rust.md
index 8e2b6a9..8a98fe6 100644
--- a/API-Rust.md
+++ b/API-Rust.md
@@ -78,6 +78,8 @@ and there isn't a real need to create wrappers specifically for them.
   * [uwr_http_send_response](#uwr_http_send_response)
   * [uwr_http_init_headers](#uwr_http_init_headers)
   * [uwr_http_add_header](#uwr_http_add_header)
+  * [uwr_http_add_header_content_type](#uwr_http_add_header_content_type)
+  * [uwr_http_add_header_content_len](#uwr_http_add_header_content_len)
   * [uwr_http_send_headers](#uwr_http_send_headers)
   * [uwr_http_response_end](#uwr_http_response_end)
   * [uwr_mem_get_init_size](#uwr_mem_get_init_size)
@@ -859,6 +861,37 @@ uwr_http_add_header(
 );
 ```
 
+### uwr_http_add_header_content_type
+
+```Rust
+pub fn uwr_http_add_header_content_type(ctx: *mut luw_ctx_t, ctype: &str);
+```
+
+A convenience function for setting the 'Content-Type' response header.
+E.g the above example that adds the _Content-Type_ header could be
+written as
+
+```Rust
+uwr_http_add_header_content_type(ctx, "text/plain");
+```
+
+### uwr_http_add_header_content_len
+
+```Rust
+pub fn uwr_http_add_header_content_len(ctx: *mut luw_ctx_t);
+```
+
+A convenience function for setting the 'Content-Length' response header.
+E.g the above example that adds the _Content-Length_ header could be
+written as
+
+```Rust
+uwr_http_add_header_content_len(ctx);
+```
+
+This function uses [uwr_get_response_data_size](#uwr_get_response_data_size)
+internally to get the size of the response data.
+
 ### uwr_http_send_headers
 
 ```Rust