Add an option to set the Content-Type of the response (#4)

README.md

@@ -198,4 +198,26 @@ It is also possible to set a range for randomizing the delay time by supplying `
   "min_response_millis": 150,
   "max_response_millis": 500
 }
-```
+```
+
+### Binary Response
+It is possible to return binary data as a response of an `endpoint` by setting the `return_value` to a base64 encoded string and by setting the `return_value_binary` to true. This is useful for returning binary files, such as images or PDFs. For example:
+```json
+{
+  "verb": "GET",
+  "path": "/my_binary_path",
+  "return_value_binary": true,
+  "return_value": "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAABaElEQVR42mL8//8/AyUYIIgBk"
+}
+```
+
+### Content Type
+Supply the optional `content_type` field to set a custom `Content-Type` for an `endpoint` (default is `application/json`):
+```json
+{
+  "verb": "GET",
+  "path": "/my_custom_content_type",
+  "content_type": "text/plain",
+  "return_value": "plaintext"
+}
+```

app.rb

@@ -158,7 +158,7 @@ def self.register_endpoint(endpoint:, sleep_time:)
     end
     method = METHODS[endpoint.verb]
     self.send(method, endpoint.path) do
-      content_type :json
+      content_type endpoint.content_type.empty? ? :json : endpoint.content_type
       body = JSON.parse(request.body.read) rescue nil
       sleep(sleep_time)
 

models/endpoint.rb

@@ -13,6 +13,7 @@ class Endpoint < Dry::Struct
 
     attribute :id, Types::Integer
     attribute :verb, Types::String
+    attribute :content_type, Types::String.default('json')
     attribute :path, Types::String
     attribute :return_value, Types::Any
     attribute :return_value_binary, Types::Bool.default(false)

models/endpoint_request.rb

@@ -10,6 +10,7 @@ class EndpointRequest < Dry::Struct
 
     attribute :verb, Types::String
     attribute :path, Types::String
+    attribute :content_type, Types::String.default('json')
     attribute :return_value, Types::Any
     attribute :return_value_binary, Types::Bool.default(false)
     attribute :min_response_millis?, Types::Integer