Gzip compress request bodies for Cloud migrate and push

Use Typecast.to_gzip to compress request bodies and set
content-encoding: gzip header, matching the pattern used
by telemetry submitter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jnunemaker

lib/flipper/cloud/migrate.rb

@@ -1,5 +1,6 @@
 require "json"
 require "flipper/adapters/http/client"
+require "flipper/typecast"
 
 module Flipper
   module Cloud
@@ -21,7 +22,7 @@ def self.migrate(flipper = Flipper, app_name: nil)
       }
 
       client = build_client("/api")
-      response = client.post("/migrate", JSON.generate(payload))
+      response = client.post("/migrate", Typecast.to_gzip(JSON.generate(payload)))
       body = JSON.parse(response.body) rescue {}
 
       MigrateResult.new(
@@ -43,7 +44,7 @@ def self.push(token, flipper = Flipper)
       client = build_client("/adapter", headers: {
         "flipper-cloud-token" => token,
       })
-      response = client.post("/import", export.contents)
+      response = client.post("/import", Typecast.to_gzip(export.contents))
       body = JSON.parse(response.body) rescue {}
 
       MigrateResult.new(
@@ -59,7 +60,7 @@ def self.build_client(path, headers: {})
 
       Flipper::Adapters::Http::Client.new(
         url: "#{base_url}#{path}",
-        headers: headers,
+        headers: {"content-encoding" => "gzip"}.merge(headers),
         open_timeout: 5,
         read_timeout: 30,
         write_timeout: 30,

spec/flipper/cloud/migrate_spec.rb

@@ -1,4 +1,5 @@
 require "flipper/cloud/migrate"
+require "flipper/typecast"
 require "webmock/rspec"
 
 RSpec.describe Flipper::Cloud, ".migrate" do
@@ -18,6 +19,11 @@
     ENV["FLIPPER_CLOUD_URL"] = original
   end
 
+  def decompress_request_body
+    raw = WebMock::RequestRegistry.instance.requested_signatures.hash.keys.last.body
+    JSON.parse(Flipper::Typecast.from_gzip(raw))
+  end
+
   describe ".migrate" do
     it "returns a MigrateResult with code and url on success" do
       stub_request(:post, "http://localhost:5555/api/migrate")
@@ -37,12 +43,24 @@
       Flipper::Cloud.migrate(flipper, app_name: "MyApp")
 
       expect(stub).to have_been_requested
-      body = JSON.parse(WebMock::RequestRegistry.instance.requested_signatures.hash.keys.last.body)
+      body = decompress_request_body
       expect(body["metadata"]["app_name"]).to eq("MyApp")
       expect(body["export"]["version"]).to eq(1)
       expect(body["export"]["features"]).to have_key("search")
     end
 
+    it "sends gzip-compressed request body" do
+      stub = stub_request(:post, "http://localhost:5555/api/migrate")
+        .with(headers: {"content-encoding" => "gzip"})
+        .to_return(status: 200, body: '{"url":"http://localhost:5555/cloud/setup/abc"}')
+
+      Flipper::Cloud.migrate(flipper)
+
+      expect(stub).to have_been_requested
+      body = decompress_request_body
+      expect(body["export"]["features"]).to have_key("search")
+    end
+
     it "handles error responses" do
       stub_request(:post, "http://localhost:5555/api/migrate")
         .to_return(status: 500, body: '{"error":"Internal Server Error"}')
@@ -107,13 +125,15 @@
       expect(stub).to have_been_requested
     end
 
-    it "sends export contents as the body" do
+    it "sends gzip-compressed export contents as the body" do
       stub = stub_request(:post, "http://localhost:5555/adapter/import")
+        .with(headers: {"content-encoding" => "gzip"})
         .to_return(status: 204, body: "")
 
       Flipper::Cloud.push("test-token", flipper)
 
-      body = JSON.parse(WebMock::RequestRegistry.instance.requested_signatures.hash.keys.last.body)
+      expect(stub).to have_been_requested
+      body = decompress_request_body
       expect(body["version"]).to eq(1)
       expect(body["features"]).to have_key("search")
     end