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, 2 insertions, 2 deletions

diff --git a/examples/c/luw-echo-request.c b/examples/c/luw-echo-request.c
index 5655c65..66c3880 100644
--- a/examples/c/luw-echo-request.c
+++ b/examples/c/luw-echo-request.c
@@ -85,8 +85,8 @@ int luw_request_handler(u8 *addr)
 	luw_http_init_headers(&ctx, 2, 0);
 
 	snprintf(clen, sizeof(clen), "%lu", luw_get_response_data_size(&ctx));
-	luw_http_add_header(&ctx, 0, "Content-Type", "text/plain");
-	luw_http_add_header(&ctx, 1, "Content-Length", clen);
+	luw_http_add_header(&ctx, "Content-Type", "text/plain");
+	luw_http_add_header(&ctx, "Content-Length", clen);
 
 	luw_http_send_headers(&ctx);