diff --git a/wsecho/Dockerfile b/wsecho/Dockerfile
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--- /dev/null
+++ b/wsecho/Dockerfile
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+FROM golang:1.18-bullseye
+
+WORKDIR /opt
+COPY wsecho.patch .
+
+RUN apt-get update && apt-get install -y patch && \
+    git clone https://github.com/gorilla/websocket.git -b v1.5.0 && \
+    patch -n websocket/examples/chat/client.go < wsecho.patch && \
+    cd websocket && \
+    go install -v ./examples/chat
+
+FROM debian:bullseye
+
+COPY --from=0 /go/bin/chat /usr/local/bin/wsecho
+CMD ["/usr/local/bin/wsecho"]
diff --git a/wsecho/README.md b/wsecho/README.md
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+++ b/wsecho/README.md
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+# wsecho
+
+This Dockerfile builds a slightly patched version of the [Gorilla "chat" example](https://github.com/gorilla/websocket/tree/78cf1bc733a927f673fd1988a25256b425552a8a/examples/chat).
+The patch removes the message size limit as many messages contain the whole shared state.
+That should be okay if access to the server is restricted.
diff --git a/wsecho/wsecho.patch b/wsecho/wsecho.patch
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index 0000000..8f2246b
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+++ b/wsecho/wsecho.patch
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+61d60
+< 	c.conn.SetReadLimit(maxMessageSize)