Add preview HTTP methods on stripe

lib/stripe.rb

@@ -120,16 +120,35 @@ module Stripe
     }
   end
 
+  class Preview
+    PREVIEW_API_VERSION = "20230509T165653"
+
+    def self._get_default_opts(opts)
+      { stripe_version: PREVIEW_API_VERSION, encoding: :json }.merge(opts)
+    end
+
+    def self.get(url, opts = {})
+      Stripe.raw_request(:get, url, {}, _get_default_opts(opts))
+    end
+
+    def self.post(url, params = {}, opts = {})
+      Stripe.raw_request(:post, url, params, _get_default_opts(opts))
+    end
+
+    def self.delete(url, opts = {})
+      Stripe.raw_request(:delete, url, {}, _get_default_opts(opts))
+    end
+  end
 
   class RawRequest
     include Stripe::APIOperations::Request
 
-    def initialize()
+    def initialize
       @opts = {}
     end
 
     def execute(method, url, params = {}, opts = {})
-      resp, _ = execute_resource_request(method, url, params, opts)
+      resp, = execute_resource_request(method, url, params, opts)
 
       resp
     end

lib/stripe/stripe_client.rb

@@ -459,6 +459,9 @@ module Stripe
 
       headers = request_headers(api_key, method)
                 .update(Util.normalize_headers(headers))
+
+      headers.delete("Content-Type") if encoding == :json && body_params.nil?
+
       url = api_url(path, api_base)
 
       # Merge given query parameters with any already encoded in the path.
@@ -885,7 +888,7 @@ module Stripe
       headers = {
         "User-Agent" => user_agent,
         "Authorization" => "Bearer #{api_key}",
-        "Content-Type" => "application/x-www-form-urlencoded",
+        "Content-Type" => "application/x-www-form-urlencoded", # TODO: (major) don't set if method is not post
       }
 
       if config.enable_telemetry? && !@last_request_metrics.nil?

test/stripe_test.rb

@@ -146,7 +146,6 @@ class StripeTest < Test::Unit::TestCase
       stub_request(:get, "#{Stripe.api_base}/v1/accounts/acc_123")
         .to_return(body: expected_body)
 
-
       resp = Stripe.raw_request(:get, "/v1/accounts/acc_123")
 
       assert_equal resp.http_body, expected_body
@@ -163,7 +162,6 @@ class StripeTest < Test::Unit::TestCase
       assert_equal resp.http_body, expected_body
     end
 
-
     should "send post request with json body and return a response" do
       expected_body = "{\"id\": \"acc_123\"}"
       stub_request(:post, "#{Stripe.api_base}/v1/accounts/acc_123")
@@ -178,16 +176,29 @@ class StripeTest < Test::Unit::TestCase
     should "send post request with json body and headers and return a response" do
       expected_body = "{\"id\": \"acc_123\"}"
       stub_request(:post, "#{Stripe.api_base}/v1/accounts/acc_123")
-        .with(body: "{\"p1\":1,\"p2\":\"string\"}", headers: { "Stripe-Account" => "bar" })
+        .with(body: "{\"p1\":1,\"p2\":\"string\"}", headers: { "Stripe-Account" => "bar" , "Content-Type" => "application/json"})
         .to_return(body: expected_body)
 
       resp = Stripe.raw_request(:post, "/v1/accounts/acc_123", { p1: 1, p2: "string" }, { encoding: :json, "Stripe-Account": "bar" })
 
+      assert_equal expected_body, resp.http_body
+    end
+
+    should "send get request with json body" do
+      expected_body = "{\"id\": \"acc_123\"}"
+      req = nil
+
+      stub_request(:get, "#{Stripe.api_base}/v1/accounts/acc_123")
+        .with { |request| req = request; true }
+        .to_return(body: expected_body)
+
+      resp = Stripe.raw_request(:get, "/v1/accounts/acc_123", {}, { encoding: :json, "Stripe-Account": "bar" })
+
+      assert_not_equal req.headers["Content-Type"], "application/x-www-form-urlencoded"
       assert_equal resp.http_body, expected_body
     end
   end
 
-
   context "deserialize" do
     should "deserializes string into known object" do
       expected_body = "{\"id\": \"acc_123\", \"object\": \"account\"}"