Revise the usage of OpenAPI Generator online (docker image) (#73)

* revise openapi generator online image usage

* remove -o from command

Author: wing328

README.md

@@ -157,26 +157,34 @@ The generated code will be located under `./out/go` in the current directory.
 
 The openapi-generator-online image can act as a self-hosted web application and API for generating code. This container can be incorporated into a CI pipeline, and requires at least two HTTP requests and some docker orchestration to access generated code.
 
-Example usage (note this assumes `jq` is installed for command line processing of JSON):
+Example usage:
 
 ```sh
-# Start container and save the container id
-CID=$(docker run -d openapitools/openapi-generator-online)
+# Start container at port 8888 and save the container id
+> CID=$(docker run -d -p 8888:8080 -e GENERATOR_HOST=http://localhost:8888 openapitools/openapi-generator-online)
+
 # allow for startup
-sleep 5
-# Get the IP of the running container
+> sleep 10
+
+# Get the IP of the running container (optional)
 GEN_IP=$(docker inspect --format '{{.NetworkSettings.IPAddress}}'  $CID)
-# Execute an HTTP request and store the download link
-RESULT=$(curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '{
-  "swaggerUrl": "https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml"
-}' 'http://localhost:8188/api/gen/clients/python' | jq '.link' | tr -d '"')
-# Download the generated zip and redirect to a file
-curl $RESULT > result.zip
-# Shutdown the swagger generator image
-docker stop $CID && docker rm $CID
-```
 
-In the example above, `result.zip` will contain the generated client.
+# Execute an HTTP request to generate a Ruby client
+> curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' \
+-d '{"openAPIUrl": "https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml"}' \
+'http://localhost:8888/api/gen/clients/ruby'
+
+{"code":"c2d483d3-3672-40e9-91df-b9ffd18d22b8","link":"http://localhost:8888/api/gen/download/c2d483d3-3672-40e9-91df-b9ffd18d22b8"}
+
+# Download the generated zip file  
+> wget http://localhost:8888/api/gen/download/c2d483d3-3672-40e9-91df-b9ffd18d22b8
+
+# Unzip the file
+> unzip c2d483d3-3672-40e9-91df-b9ffd18d22b8
+
+# Shutdown the openapi generator image
+> docker stop $CID && docker rm $CID
+```
 
 #### Development in docker