Adds api_version property, adds 'Accept-Version' to headers (#512)

.github/CHANGELOG.md

@@ -31,6 +31,9 @@
 
 <h3>Improvements</h3>
 
+* `Connection` objects now send versioned requests to the platform API.
+  [(#512)](https://github.com/XanaduAI/strawberryfields/pull/512)
+
 * The `copies` option when constructing a `TDMProgram` have been removed. Instead, the number of
   copies of a TDM algorithm can now be set by passing the `shots` keyword argument to
   the `eng.run()` method.
@@ -92,7 +95,7 @@
 
 This release contains contributions from (in alphabetical order):
 
-Theodor Isacsson, Josh Izaac, Fabian Laudenbach, Nicolas Quesada, Antal Száva.
+Jack Brown, Theodor Isacsson, Josh Izaac, Fabian Laudenbach, Nicolas Quesada, Antal Száva.
 
 # Release 0.16.0 (current release)
 

strawberryfields/api/connection.py

@@ -96,10 +96,15 @@ def __init__(
         self._verbose = verbose
 
         self._base_url = "http{}://{}:{}".format("s" if self.use_ssl else "", self.host, self.port)
-        self._headers = {"Authorization": self.token}
+        self._headers = {"Authorization": self.token, "Accept-Version": self.api_version}
 
         self.log = create_logger(__name__)
 
+    @property
+    def api_version(self) -> str:
+        """str: The platform API version to request."""
+        return "1.0.0"
+
     @property
     def token(self) -> str:
         """The API authentication token.