swagger auto-generated flask server headers - flask

Question

I'm using swagger editor (version 2.10.5) to generate a flask api that uses custom headers and started to add the following line to each path:
parameters:
- $ref: '#/parameters/X-Forwarded-Host'
the relative definition:
X-Forwarded-Host:
name: 'X-Forwarded-Host'
in: header
description: Forwarded host header
required: true
type: string
Then running the auto-generated flask server
$ python3 -m swagger_server
creates some problems:
When making a curl request, headers are not right evaluated:
$ curl -X GET --header 'Accept: application/json' --header 'X-Forwarded-Host: example.com' http://localhost:8080
returns
health_get() missing required positional argument: 'X_Forwarded_Host'
Auto-generated tests are useless too:
headers = [('X_Forwarded_Host', 'X_Forwarded_Host_example'), ...
What am I doing wrong? Why is swagger-editor (or codegen) setting all "-" to "_"?
Thanks in advance

Answer 1

Ok, I figured out..
The problem was NOT with swagger-editor itself but how it generates the flask (Connexion) code.
Connexion request handling docs (url) says:
"Currently, header parameters are not passed to the handler functions as parameters. But they can be accessed through the underlying connexion.request.headers object which aliases the flask.request.headers object."
The solution is to remove all function attributes (related to headers) from the auto-generated controller and pick them from the request object, therefore:
From:
def health_get(X_Forwarded_Host):
...
To:
def health_get():
forwarded_host = connexion.request.headers['X-Forwarded-Host']
Bye!