initial commit

fluxer_gateway/src/gateway/health_handler.erl

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+%% Copyright (C) 2026 Fluxer Contributors
+%%
+%% This file is part of Fluxer.
+%%
+%% Fluxer is free software: you can redistribute it and/or modify
+%% it under the terms of the GNU Affero General Public License as published by
+%% the Free Software Foundation, either version 3 of the License, or
+%% (at your option) any later version.
+%%
+%% Fluxer is distributed in the hope that it will be useful,
+%% but WITHOUT ANY WARRANTY; without even the implied warranty of
+%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+%% GNU Affero General Public License for more details.
+%%
+%% You should have received a copy of the GNU Affero General Public License
+%% along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+
+-module(health_handler).
+
+-export([init/2]).
+
+init(Req0, State) ->
+    Req = cowboy_req:reply(
+        200,
+        #{<<"content-type">> => <<"text/plain">>},
+        <<"OK">>,
+        Req0
+    ),
+    {ok, Req, State}.