fix(ci): fix proxy_send_local_response ABI + eliminate NULL config path

- Fix argument order in pw_proxy_send_local_response: headers are args[5-6]
  per proxy-wasm ABI spec, not args[1-2] (which are status_code_details)
- Pass empty strings instead of NULL for unconfigured proxy-wasm calls,
  eliminating the only difference between the working configured path and
  the failing unconfigured path on x86_64 CI
- Add -t 120 timeout to varnishtest to handle slower CI runners
- Mark .wasm files as binary in .gitattributes
- Reduce block test fuel to 10M (matches passing lifecycle test)

Author: RamazanKara

.gitattributes

@@ -1,3 +1,6 @@
 # Prevent git from modifying line endings in vendored sources
 # (cargo checksums are sensitive to byte-exact content)
 examples/proxy-wasm-filter/vendor/** -text
+
+# Binary Wasm modules must not be modified
+*.wasm binary

Makefile.am

@@ -12,7 +12,7 @@ check-local:
 	@if test -n "$(VARNISHTEST)"; then \
 		for t in $(srcdir)/tests/*.vtc; do \
 			echo "Running $$t..."; \
-			$(VARNISHTEST) \
+			$(VARNISHTEST) -t 120 \
 				-Dvmod_wasm="$(abs_top_builddir)/src/.libs/libvmod_wasm.so" \
 				-Dwasm_module="$(abs_top_srcdir)/tests/wasm/test_module.wasm" \
 				-Dsdk_module="$(abs_top_srcdir)/tests/wasm/proxy_wasm_filter.wasm" \

src/proxy_wasm.c

@@ -181,14 +181,14 @@ pw_proxy_send_local_response(void *env, wasmtime_caller_t *caller,
 
 	/*
 	 * ABI: proxy_send_local_response(
-	 *   status_code,           // args[0] i32
-	 *   headers_ptr,           // args[1] i32 (serialized header map)
-	 *   headers_size,          // args[2] i32
-	 *   body_ptr,              // args[3] i32
-	 *   body_size,             // args[4] i32
-	 *   grpc_status,           // args[5] i32 (ignored)
-	 *   grpc_status_msg_ptr,   // args[6] i32 (ignored)
-	 *   grpc_status_msg_size   // args[7] i32 (ignored)
+	 *   status_code,              // args[0] i32
+	 *   status_details_ptr,       // args[1] i32
+	 *   status_details_size,      // args[2] i32
+	 *   body_ptr,                 // args[3] i32
+	 *   body_size,                // args[4] i32
+	 *   headers_ptr,              // args[5] i32 (serialized header map)
+	 *   headers_size,             // args[6] i32
+	 *   grpc_status               // args[7] i32 (ignored)
 	 * )
 	 */
 	ctx->local_response_set = 1;
@@ -209,8 +209,8 @@ pw_proxy_send_local_response(void *env, wasmtime_caller_t *caller,
 	}
 
 	/* Capture response headers (serialized proxy-wasm format) */
-	headers_ptr = (uint32_t)args[1].of.i32;
-	headers_size = (uint32_t)args[2].of.i32;
+	headers_ptr = (uint32_t)args[5].of.i32;
+	headers_size = (uint32_t)args[6].of.i32;
 	if (headers_size > 0 && pw_validate_region(ctx, headers_ptr, headers_size)) {
 		free(ctx->local_response_headers);
 		ctx->local_response_headers = malloc(headers_size);

src/wasm_engine.c

@@ -975,7 +975,7 @@ vwasm_proxy_wasm_call(struct vwasm_engine *engine,
     int *status_code)
 {
 	return (proxy_wasm_execute(engine, ctx, module_name,
-	    VWASM_PHASE_REQUEST, NULL, NULL, status_code));
+	    VWASM_PHASE_REQUEST, "", "", status_code));
 }
 
 int
@@ -985,7 +985,7 @@ vwasm_proxy_wasm_response_call(struct vwasm_engine *engine,
     int *status_code)
 {
 	return (proxy_wasm_execute(engine, ctx, module_name,
-	    VWASM_PHASE_RESPONSE, NULL, NULL, status_code));
+	    VWASM_PHASE_RESPONSE, "", "", status_code));
 }
 
 int

tests/proxy_wasm_block.vtc

@@ -10,7 +10,7 @@ varnish v1 -vcl+backend {
 
     sub vcl_init {
         wasm.load("filter", "${wasm_module}");
-        wasm.set_fuel(100000000);
+        wasm.set_fuel(10000000);
     }
 
     sub vcl_recv {