Fix HTTP_ANY macro conflict with Arduino core: rename enum to HTTP_ALL, provide HTTP_ANY as backward-compat constexpr

Co-authored-by: mathieucarbou <61346+mathieucarbou@users.noreply.github.com>

Author: Copilot

src/ESPAsyncWebServer.h

@@ -97,7 +97,7 @@ enum AsyncWebRequestMethodType {
   HTTP_MOVE = 0b0001000000000000,
   HTTP_COPY = 0b0010000000000000,
   HTTP_RESERVED = 0b0100000000000000,
-  HTTP_ANY = 0b0111111111111111,
+  HTTP_ALL = 0b0111111111111111,
 };
 };  // namespace AsyncWebRequestMethod
 
@@ -112,6 +112,18 @@ extern constexpr inline WebRequestMethodComposite operator|(WebRequestMethod l,
   return static_cast<WebRequestMethodComposite>(l) | r;
 };
 
+// HTTP_ANY is commonly defined as a macro in Arduino core HTTP client libraries (e.g., ESP8266 HTTPClient.h).
+// Macros are expanded by the preprocessor before C++ namespace resolution, so even a namespace-qualified
+// reference like AsyncWebRequestMethod::HTTP_ANY would be incorrectly expanded to AsyncWebRequestMethod::0.
+// To avoid this conflict, HTTP_ANY is provided here as a C++ constexpr (not a macro), after undefining
+// any previously defined HTTP_ANY macro. Use HTTP_ALL as the canonical non-conflicting name.
+#ifdef HTTP_ANY
+  #undef HTTP_ANY
+#endif
+namespace AsyncWebRequestMethod {
+  static constexpr AsyncWebRequestMethodType HTTP_ANY = HTTP_ALL;
+}  // namespace AsyncWebRequestMethod
+
 #if !defined(ASYNCWEBSERVER_NO_GLOBAL_HTTP_METHODS)
 // Import the method enum values to the global namespace
 using namespace AsyncWebRequestMethod;
@@ -1556,7 +1568,7 @@ class AsyncWebServer : public AsyncMiddlewareChain {
   bool removeHandler(AsyncWebHandler *handler);
 
   AsyncCallbackWebHandler &on(AsyncURIMatcher uri, ArRequestHandlerFunction onRequest) {
-    return on(std::move(uri), AsyncWebRequestMethod::HTTP_ANY, onRequest);
+    return on(std::move(uri), AsyncWebRequestMethod::HTTP_ALL, onRequest);
   }
   AsyncCallbackWebHandler &on(
     AsyncURIMatcher uri, WebRequestMethodComposite method, ArRequestHandlerFunction onRequest, ArUploadHandlerFunction onUpload = nullptr,

src/WebHandlerImpl.h

@@ -62,7 +62,7 @@ class AsyncCallbackWebHandler : public AsyncWebHandler {
   bool _isRegex;
 
 public:
-  AsyncCallbackWebHandler() : _uri(), _method(AsyncWebRequestMethod::HTTP_ANY), _onRequest(NULL), _onUpload(NULL), _onBody(NULL), _isRegex(false) {}
+  AsyncCallbackWebHandler() : _uri(), _method(AsyncWebRequestMethod::HTTP_ALL), _onRequest(NULL), _onUpload(NULL), _onBody(NULL), _isRegex(false) {}
   void setUri(AsyncURIMatcher uri);
   void setMethod(WebRequestMethodComposite method) {
     _method = method;

src/WebRequest.cpp

@@ -40,7 +40,7 @@ enum {
 
 AsyncWebServerRequest::AsyncWebServerRequest(AsyncWebServer *s, AsyncClient *c)
   : _client(c), _server(s), _handler(NULL), _response(NULL), _onDisconnectfn(NULL), _temp(), _parseState(PARSE_REQ_START), _version(0),
-    _method(AsyncWebRequestMethod::HTTP_ANY), _url(), _host(), _contentType(), _boundary(), _authorization(), _reqconntype(RCT_HTTP),
+    _method(AsyncWebRequestMethod::HTTP_ALL), _url(), _host(), _contentType(), _boundary(), _authorization(), _reqconntype(RCT_HTTP),
     _authMethod(AsyncAuthType::AUTH_NONE), _isMultipart(false), _isPlainPost(false), _expectingContinue(false), _contentLength(0), _parsedLength(0),
     _multiParseState(0), _boundaryPosition(0), _itemStartIndex(0), _itemSize(0), _itemName(), _itemFilename(), _itemType(), _itemValue(), _itemBuffer(0),
     _itemBufferIndex(0), _itemIsFile(false), _chunkStartIndex(0), _chunkOffset(0), _chunkSize(0), _chunkedParseState(CHUNK_NONE), _chunkedLastChar(0),
@@ -1312,7 +1312,7 @@ String AsyncWebServerRequest::urlDecode(const String &text) const {
 }
 
 const char *AsyncWebServerRequest::methodToString() const {
-  if (_method == AsyncWebRequestMethod::HTTP_ANY) {
+  if (_method == AsyncWebRequestMethod::HTTP_ALL) {
     return T_ANY;
   }
   if (_method & AsyncWebRequestMethod::HTTP_GET) {