fix(http): don't segfault on non-routed requests

include/http_loop.h

@@ -34,6 +34,8 @@ typedef enum http_route_type {
  */
 typedef bool (*step)(event_loop_conn *conn);
 
+extern const step http_default_res_steps[HTTP_LOOP_MAX_STEPS];
+
 /**
  * Struct describing a route a request can take.
  */

src/http_loop/http_loop.c

@@ -4,6 +4,9 @@
 #include "http_loop.h"
 #include "log.h"
 
+const step http_default_res_steps[HTTP_LOOP_MAX_STEPS] = {
+    http_loop_step_write_header, http_loop_step_write_body, NULL};
+
 bool http_loop_handle_request(event_loop_conn *conn) {
   // Prevents the request handler function from looping indefinitely without
   // ever consuming new data

src/http_loop/http_loop_res.c

@@ -105,9 +105,12 @@ bool http_loop_step_write_body(event_loop_conn *conn) {
 void http_loop_handle_response(event_loop_conn *conn) {
   http_loop_ctx *ctx = conn->ctx;
 
+  // Non-routed requests also need to be processed
+  const step *steps =
+      ctx->route != NULL ? ctx->route->steps_res : http_default_res_steps;
+
   while ((conn->state == event_loop_conn_state_res) &&
-         (ctx->route->steps_res[ctx->current_step] != NULL) &&
-         ctx->route->steps_res[ctx->current_step](conn)) {
+         (steps[ctx->current_step] != NULL) && steps[ctx->current_step](conn)) {
     ctx->current_step++;
   }
 
@@ -115,7 +118,7 @@ void http_loop_handle_response(event_loop_conn *conn) {
   // After response processing has finished its work, we reset the context to
   // prepare for a new request
   if ((conn->state != event_loop_conn_state_res) ||
-      (ctx->route->steps_res[ctx->current_step] == NULL)) {
+      (steps[ctx->current_step] == NULL)) {
     http_loop_ctx_reset(ctx);
 
     conn->state = event_loop_conn_state_req;