diff --git a/.circleci/config.yml b/.circleci/config.yml
index fb4cfedbfe..f0d1ba0c86 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -145,9 +145,13 @@ jobs:
       - run:
           name: Start socket server
           command: ./scripts/socketserver/start.sh
+      - run:
+          name: Start http server
+          command: ./scripts/httpserver/start.sh
       - run:
           name: Run tests
           environment:
+            HTTPSERVER_ENABLED: 1
             TENDERMINT_ENABLED: 1
             SOCKETSERVER_ENABLED: 1
             SKIP_BUILD: 1
@@ -166,6 +170,7 @@ jobs:
           name: Run CLI examples
           working_directory: packages/cli
           environment:
+            HTTPSERVER_ENABLED: 1
             TENDERMINT_ENABLED: 1
             SOCKETSERVER_ENABLED: 1
             SKIP_BUILD: 1
@@ -177,6 +182,7 @@ jobs:
       - run:
           name: Stop chains
           command: |
+            ./scripts/httpserver/stop.sh
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
             ./scripts/<< parameters.simapp >>/stop.sh
@@ -265,8 +271,12 @@ jobs:
       - run:
           name: Start socket server
           command: ./scripts/socketserver/start.sh
+      - run:
+          name: Start http server
+          command: ./scripts/httpserver/start.sh
       - run:
           environment:
+            HTTPSERVER_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -285,6 +295,7 @@ jobs:
           name: Run CLI examples
           working_directory: packages/cli
           environment:
+            HTTPSERVER_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -295,6 +306,7 @@ jobs:
       - run:
           name: Stop chains
           command: |
+            ./scripts/httpserver/stop.sh
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
             ./scripts/simapp42/stop.sh
@@ -376,8 +388,12 @@ jobs:
       - run:
           name: Start socket server
           command: ./scripts/socketserver/start.sh
+      - run:
+          name: Start http server
+          command: ./scripts/httpserver/start.sh
       - run:
           environment:
+            HTTPSERVER_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -388,6 +404,7 @@ jobs:
       - run:
           name: Stop chains
           command: |
+            ./scripts/httpserver/stop.sh
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
             ./scripts/simapp42/stop.sh
@@ -468,8 +485,12 @@ jobs:
       - run:
           name: Start socket server
           command: ./scripts/socketserver/start.sh
+      - run:
+          name: Start http server
+          command: ./scripts/httpserver/start.sh
       - run:
           environment:
+            HTTPSERVER_ENABLED: 1
             SIMAPP42_ENABLED: 1
             SLOW_SIMAPP42_ENABLED: 1
             TENDERMINT_ENABLED: 1
@@ -483,6 +504,7 @@ jobs:
       - run:
           name: Stop chains
           command: |
+            ./scripts/httpserver/stop.sh
             ./scripts/socketserver/stop.sh
             ./scripts/tendermint/all_stop.sh
             ./scripts/simapp42/stop.sh
diff --git a/HACKING.md b/HACKING.md
index 9813ffcad3..8080f2d8d9 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -64,13 +64,19 @@ export TENDERMINT_ENABLED=1
 ./scripts/socketserver/start.sh
 export SOCKETSERVER_ENABLED=1
 
+# Start Http server
+./scripts/httpserver/start.sh
+export HTTPSERVER_ENABLED=1
+
 # now more tests are running that were marked as "pending" before
 yarn test
 
 # And at the end of the day
+unset HTTPSERVER_ENABLED
 unset SOCKETSERVER_ENABLED
 unset TENDERMINT_ENABLED
 unset LAUNCHPAD_ENABLED
+./scripts/httpserver/stop.sh
 ./scripts/socketserver/stop.sh
 ./scripts/tendermint/all_stop.sh
 ./scripts/launchpad/stop.sh
@@ -100,6 +106,7 @@ order to avoid conflicts. Here is an overview of the ports used:
 | 1319  | wasmd LCD API         | Manual Stargate debugging       |
 | 4444  | socketserver          | @cosmjs/sockets tests           |
 | 4445  | socketserver slow     | @cosmjs/sockets tests           |
+| 5555  | httpserver            | @cosmjs/tendermint-rpc tests    |
 | 9090  | simapp gRPC           | Manual Stargate debugging       |
 | 11134 | Tendermint 0.34 RPC   | @cosmjs/tendermint-rpc tests    |
 | 26658 | simapp Tendermint RPC | Stargate client tests           |
diff --git a/scripts/httpserver/Dockerfile b/scripts/httpserver/Dockerfile
new file mode 100644
index 0000000000..159714325e
--- /dev/null
+++ b/scripts/httpserver/Dockerfile
@@ -0,0 +1,7 @@
+FROM python:3.9-alpine
+
+WORKDIR /usr/src/app
+
+COPY echo.py ./
+
+ENTRYPOINT ["python", "./echo.py"]
diff --git a/scripts/httpserver/echo.py b/scripts/httpserver/echo.py
new file mode 100755
index 0000000000..4582d55276
--- /dev/null
+++ b/scripts/httpserver/echo.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+#pylint:disable=missing-docstring,invalid-name
+
+import argparse
+from http.server import HTTPServer, BaseHTTPRequestHandler
+import json
+import sys
+
+HOST = "0.0.0.0"
+
+def log(data):
+    print(data, flush=True)
+
+class CORSRequestHandler(BaseHTTPRequestHandler):
+    def end_headers(self):
+        self.send_header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
+        self.send_header("Access-Control-Allow-Origin", "*")
+        self.send_header("Access-Control-Allow-Headers", "*")
+        BaseHTTPRequestHandler.end_headers(self)
+
+    def do_OPTIONS(self):
+        self.send_response(200)
+        self.end_headers()
+
+    def do_GET(self):
+        """Respond to a GET request."""
+        if self.path == "/echo_headers":
+            self.send_response(200)
+            self.send_header("Content-type", "text/plain")
+            self.send_header('Content-type', 'application/json')
+            self.end_headers()
+            body = {
+                "request_headers": dict(self.headers)
+            }
+            self.wfile.write(json.dumps(body, sort_keys=True).encode())
+        else:
+            self.send_response(404)
+            self.wfile.write("404. Try /echo_headers".encode())
+
+    def do_POST(self):
+        self.do_GET()
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--port",
+        help="Port to listen on",
+        type=int,
+        default=5555)
+    args = parser.parse_args()
+    httpd = HTTPServer((HOST, args.port), CORSRequestHandler)
+    log("Starting server at {}:{}".format(HOST, args.port))
+    httpd.serve_forever()
+    log("Running now.")
diff --git a/scripts/httpserver/start.sh b/scripts/httpserver/start.sh
new file mode 100755
index 0000000000..95546d9b98
--- /dev/null
+++ b/scripts/httpserver/start.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+set -o errexit -o nounset -o pipefail
+command -v shellcheck >/dev/null && shellcheck "$0"
+
+# Please keep this in sync with the Ports overview in HACKING.md
+DEFAULT_PORT_GUEST="5555"
+DEFAULT_PORT_HOST="5555"
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+HTTPSERVER_DIR=$(mktemp -d "${TMPDIR:-/tmp}/httpserver.XXXXXXXXX")
+export HTTPSERVER_DIR
+echo "HTTPSERVER_DIR = $HTTPSERVER_DIR"
+
+IMAGE_NAME="httpserver:local"
+CONTAINER_NAME="httpserver"
+
+LOGFILE_DEFAULT="${HTTPSERVER_DIR}/httpserver_$DEFAULT_PORT_HOST.log"
+
+docker build -t "$IMAGE_NAME" "$SCRIPT_DIR"
+
+docker run --rm \
+  --user="$UID" \
+  --name "$CONTAINER_NAME" \
+  -p "$DEFAULT_PORT_HOST:$DEFAULT_PORT_GUEST" \
+  "$IMAGE_NAME" \
+  >"$LOGFILE_DEFAULT" &
+
+# Debug start
+sleep 3
+cat "$LOGFILE_DEFAULT"
diff --git a/scripts/httpserver/stop.sh b/scripts/httpserver/stop.sh
new file mode 100755
index 0000000000..74d04dcbf8
--- /dev/null
+++ b/scripts/httpserver/stop.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+set -o errexit -o nounset -o pipefail
+command -v shellcheck >/dev/null && shellcheck "$0"
+
+CONTAINER_NAME="httpserver"
+
+echo "Killing socketserver containers ..."
+docker container kill "$CONTAINER_NAME"