Add mention of PROXY_MODE

Author: Potherca

README.md

@@ -68,8 +68,9 @@ only advised in development.
 
 For security reasons, the server expects to run on HTTPS (also known as HTTP+TLS).
 
-To run insecure, set the environment variable `ENVIRONMENT` to `develop`. This
-will prohibit the application from running in production mode.
+To run insecure, for instance when the application is run behind a proxy or in a
+PHP-FPM (or similar) setup, set the environment variable `PROXY_MODE`.
+This will allow the application to accept HTTP requests.
 
 ### Docker images
 
@@ -197,6 +198,11 @@ The underlying functionality for these features is provided by:
 
 ## Development
 
+The easiest way to develop this project is by running the environment provided
+by the `docker-compose.yml` file. This can be done by running `docker-compose up`.
+
+This will start the application and a pubsub server in separate docker containers.
+
 ### Project structure
 
 This project is structured as follows:

docker-compose.yml

@@ -4,8 +4,13 @@ services:
         build:
             context: .
         environment:
+            # During development it can be useful to set the ENVIRONMENT to "development"
+            # in order to see more details about the errors.
+            # ENVIRONMENT: development
             USERNAME: alice
             PASSWORD: alice123
+            # to run in HTTP mode, set PROXY_MODE
+            # PROXY_MODE: true
             PUBSUB_URL: http://pubsub:8080
         ports:
             - 80:80