UNTESTED: fix for sending proper content type on config endpoint

esp32/include/utils/string_utils.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include <string>
+
+// Source - https://stackoverflow.com/a
+// Posted by Joseph, modified by community. See post 'Timeline' for change history
+// Retrieved 2026-01-26, License - CC BY-SA 3.0
+
+inline bool ends_with(std::string const & value, std::string const & ending)
+{
+    if (ending.size() > value.size()) return false;
+    return std::equal(ending.rbegin(), ending.rend(), value.rbegin());
+}

esp32/src/filesystem.cpp

@@ -2,6 +2,7 @@
 #include <communication/webserver.h>
 #include <vector>
 #include <cstring>
+#include "utils/string_utils.hpp"
 
 static const char *TAG = "FileService";
 
@@ -107,7 +108,13 @@ esp_err_t getConfigFile(httpd_req_t *request) {
     }
     String content = file.readString();
     file.close();
-    httpd_resp_set_type(request, "application/json");
+    if (ends_with(path, ".pb")) {
+        httpd_resp_set_type(request, "application/x-protobuf");
+    } else if (ends_with(path, ".json")) {
+        httpd_resp_set_type(request, "application/json");
+    } else {
+        httpd_resp_set_type(request, "text/plain");
+    }
     return httpd_resp_send(request, content.c_str(), content.length());
 }