starlette on docker x-forwarded-proto

app.py

from starlette.requests import Request
from starlette.responses import JSONResponse


async def app(scope, receive, send):
    request = Request(scope, receive)
    response = JSONResponse(
        {"scheme": request.url.scheme, "headers": dict(request.headers),}
    )
    await response(scope, receive, send)

Dockerfile

FROM debian:10-slim

RUN apt-get update && \
  apt-get install -y --no-install-recommends \
  gcc make python3 python3-dev python3-pip

RUN pip3 install setuptools wheel
RUN pip3 install uvicorn starlette
COPY app.py app.py

CMD ["uvicorn", "app:app", "--port", "8080", "--host", "0.0.0.0", "--proxy-headers"]

package versions:
httptools==0.1.1
starlette==0.13.4
uvicorn==0.11.5
uvloop==0.14.0

running locally with uvicorn app:app --port 8080 --proxy-headers:

$ http :8080/ X-forwarded-proto:https
HTTP/1.1 200 OK
content-length: 185
content-type: application/json
date: Mon, 22 Jun 2020 17:39:52 GMT
server: uvicorn

{
    "headers": {
        "accept": "*/*",
        "accept-encoding": "gzip, deflate",
        "connection": "keep-alive",
        "host": "localhost:8080",
        "user-agent": "HTTPie/2.1.0",
        "x-forwarded-proto": "https"
    },
    "scheme": "https"
}

running with docker run -p 8080:8080 --rm -it httpsmwe:latest:

$ http :8080/ X-forwarded-proto:https
HTTP/1.1 200 OK
content-length: 184
content-type: application/json
date: Mon, 22 Jun 2020 17:40:20 GMT
server: uvicorn

{
    "headers": {
        "accept": "*/*",
        "accept-encoding": "gzip, deflate",
        "connection": "keep-alive",
        "host": "localhost:8080",
        "user-agent": "HTTPie/2.1.0",
        "x-forwarded-proto": "https"
    },
    "scheme": "http"
}