fix: reset sapi response code (#964)

* fix: reset sapi response code
It turns out that the sapi response code is NOT reset between requests by the zend engine. This resets the code for cgi-based requests.
fixes: #960

* update response header test

* fix assertion

* appears to affect workers too

frankenphp.c

@@ -455,6 +455,9 @@ int frankenphp_update_server_context(
     ctx = (frankenphp_server_context *)SG(server_context);
   }
 
+  // It is not reset by zend engine, set it to 200.
+  SG(sapi_headers).http_response_code = 200;
+
   ctx->main_request = main_request;
   ctx->current_request = current_request;
 

frankenphp_test.go

@@ -246,6 +246,12 @@ func testResponseHeaders(t *testing.T, opts *testOptions) {
 		resp := w.Result()
 		body, _ := io.ReadAll(resp.Body)
 
+		if i%3 != 0 {
+			assert.Equal(t, i+100, resp.StatusCode)
+		} else {
+			assert.Equal(t, 200, resp.StatusCode)
+		}
+
 		assert.Contains(t, string(body), "'X-Powered-By' => 'PH")
 		assert.Contains(t, string(body), "'Foo' => 'bar',")
 		assert.Contains(t, string(body), "'Foo2' => 'bar2',")

testdata/response-headers.php

@@ -7,7 +7,9 @@ return function () {
     header('Foo2: bar2');
     header('Invalid');
     header('I: ' . ($_GET['i'] ?? 'i not set'));
-    http_response_code(201);
+    if ($_GET['i'] % 3) {
+        http_response_code($_GET['i'] + 100);
+    }
 
     var_export(apache_response_headers());
 };