Added specs-url-scheme option for Api.

.gitignore

@@ -62,3 +62,9 @@ doc/_build/
 # Specifics
 flask_restx/static
 node_modules
+
+# pyenv
+.python-version
+
+# Jet Brains
+.idea

flask_restx/api.py

@@ -94,6 +94,9 @@ class Api(object):
     :param FormatChecker format_checker: A jsonschema.FormatChecker object that is hooked into
         the Model validator. A default or a custom FormatChecker can be provided (e.g., with custom
         checkers), otherwise the default action is to not enforce any format validation.
+    :param url_scheme: If set to a string (e.g. http, https), then the specs_url and base_url will explicitly use this
+        scheme regardless of how the application is deployed. This is necessary for some deployments behind a reverse
+        proxy.
     """
 
     def __init__(
@@ -123,6 +126,7 @@ def __init__(
         catch_all_404s=False,
         serve_challenge_on_401=False,
         format_checker=None,
+        url_scheme=None,
         **kwargs
     ):
         self.version = version
@@ -178,6 +182,7 @@ def __init__(
             api=self,
             path="/",
         )
+        self.url_scheme = url_scheme
         if app is not None:
             self.app = app
             self.init_app(app)
@@ -198,7 +203,9 @@ def init_app(self, app, **kwargs):
         :param str contact: A contact email for the API (used in Swagger documentation)
         :param str license: The license associated to the API (used in Swagger documentation)
         :param str license_url: The license page URL (used in Swagger documentation)
-
+        :param url_scheme: If set to a string (e.g. http, https), then the specs_url and base_url will explicitly use
+            this scheme regardless of how the application is deployed. This is necessary for some deployments behind a
+            reverse proxy.
         """
         self.app = app
         self.title = kwargs.get("title", self.title)
@@ -209,6 +216,7 @@ def init_app(self, app, **kwargs):
         self.contact_email = kwargs.get("contact_email", self.contact_email)
         self.license = kwargs.get("license", self.license)
         self.license_url = kwargs.get("license_url", self.license_url)
+        self.url_scheme = kwargs.get("url_scheme", self.url_scheme)
         self._add_specs = kwargs.get("add_specs", True)
 
         # If app is a blueprint, defer the initialization
@@ -220,7 +228,6 @@ def init_app(self, app, **kwargs):
         else:
             self.blueprint = app
 
-
     def _init_app(self, app):
         """
         Perform initialization actions with the given :class:`flask.Flask` object.
@@ -261,7 +268,6 @@ def _init_app(self, app):
                 DeprecationWarning
             )
 
-
     def __getattr__(self, name):
         try:
             return getattr(self.default_namespace, name)
@@ -515,11 +521,16 @@ def endpoint(self, name):
     @property
     def specs_url(self):
         """
-        The Swagger specifications relative url (ie. `swagger.json`)
+        The Swagger specifications relative url (ie. `swagger.json`). If
+        the spec_url_scheme attribute is set, then the full url is provided instead
+        (e.g. http://localhost/swaggger.json).
 
         :rtype: str
         """
-        return url_for(self.endpoint("specs"))
+        external = None if self.url_scheme is None else True
+        return url_for(
+            self.endpoint("specs"), _scheme=self.url_scheme, _external=external
+        )
 
     @property
     def base_url(self):
@@ -528,7 +539,7 @@ def base_url(self):
 
         :rtype: str
         """
-        return url_for(self.endpoint("root"), _external=True)
+        return url_for(self.endpoint("root"), _scheme=self.url_scheme, _external=True)
 
     @property
     def base_path(self):

tests/test_api.py

@@ -342,3 +342,13 @@ class TestResource(restx.Resource):
         assert decorator1.called is True
         assert decorator2.called is True
         assert decorator3.called is True
+
+    def test_specs_url(self, app):
+        api = restx.Api(app)
+        specs_url = api.specs_url
+        assert specs_url == "/swagger.json"
+
+    def test_url_scheme(self, app):
+        api = restx.Api(app, url_scheme="https")
+        assert api.specs_url == "https://localhost/swagger.json"
+        assert api.base_url == "https://localhost/"