libunit-wasm: Remove the idx argument from luw_http_add_header()

This was used to specify the index of the response header being added,
starting at 0 and incrementing by one for each header.

Instead of having the programmer specify this, track it internally.

We add an extra check in luw_http_add_header() to make sure we aren't
trying to add more headers than we said with luw_http_init_headers(), if
we are, simply return.

This updates the API-C.md and the various examples and 'rusty' API
wrapper.

Suggested-by: Liam Crilly <liam@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/examples/rust/upload-reflector/src/lib.rs b/examples/rust/upload-reflector/src/lib.rs
index 01138b0..43bd1c6 100644
--- a/examples/rust/upload-reflector/src/lib.rs
+++ b/examples/rust/upload-reflector/src/lib.rs
@@ -49,10 +49,9 @@ pub fn upload_reflector(ctx: *mut luw_ctx_t) -> i32 {
         }
 
         uwr_http_init_headers(ctx, 2, 0);
-        uwr_http_add_header(ctx, 0, "Content-Type", ct);
+        uwr_http_add_header(ctx, "Content-Type", ct);
         uwr_http_add_header(
             ctx,
-            1,
             "Content-Length",
             &format!("{}", uwr_get_http_content_len(ctx)),
         );