Using env variable in RUN curl: (6) Could not resolve host: =

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1

I have these ENV variable in my Dockerfile:

ENV SERVER_URL = ‘http://hostname:8081/bot’
ENV TOKEN = ‘12350CyqQUy4’

…

RUN curl $SERVER_URL$TOKEN /web?url=http://app:8000/api

the i will get this error :

curl: (6) Could not resolve host: =
curl: (3) URL using bad/illegal format or missing URL