diff --git a/shard.yml b/shard.yml
index 968df7c..724b8a6 100644
--- a/shard.yml
+++ b/shard.yml
@@ -14,11 +14,11 @@ executables:
 development_dependencies:
   ameba:
     github: crystal-ameba/ameba
-    version: ~> 1.0.0
+    version: ~> 1.3
   webmock:
     github: manastech/webmock.cr
     version: 0.14.0
 
-crystal: 1.5.0
+crystal: ~> 1.6
 
 license: MIT
diff --git a/spec/replay/http/record_spec.cr b/spec/replay/http/record_spec.cr
index c0cf748..109f2ab 100644
--- a/spec/replay/http/record_spec.cr
+++ b/spec/replay/http/record_spec.cr
@@ -30,4 +30,18 @@ describe HTTPRecord do
     actual_metadatas["headers"]["Set-Cookie"].should eq("foo=bar")
     actual_metadatas["status"].should eq(201)
   end
+  it "can get properties via json formatted response contains array" do
+    body = IO::Memory.new "HELLO"
+    header = IO::Memory.new "{\"headers\":{\"Content-Type\":\"text/plain\",\"Server\":\"test_server\",\"Cookie\":[\"foo=bar\",\"baz=qux\"]},\"status\":201}"
+    request = MockRequest.new("db0da", "db0da_1770a", {"foo" => "bar"})
+    record = HTTPRecord.new(header, body, request)
+    # Write to response
+    actual_body = record.entity
+    actual_body.should eq("HELLO")
+    actual_metadatas = record.metadatas
+    actual_metadatas["headers"]["Content-Type"].should eq("text/plain")
+    actual_metadatas["headers"]["Server"].should eq("test_server")
+    actual_metadatas["headers"]["Cookie"].should eq("foo=bar;baz=qux")
+    actual_metadatas["status"].should eq(201)
+  end
 end
diff --git a/src/replay/http/record.cr b/src/replay/http/record.cr
index 97071dd..bdd3a18 100644
--- a/src/replay/http/record.cr
+++ b/src/replay/http/record.cr
@@ -11,21 +11,32 @@ class HTTPRecord
   end
 
   def initialize(client_response : HTTP::Client::Response, request : Request)
-    initialize(
-      headers: client_response.headers,
-      body: client_response.body,
-      response_status: client_response.status_code,
-      response: client_response.not_nil!,
-      request: request,
-    )
+    if client_response
+      initialize(
+        headers: client_response.headers,
+        body: client_response.body,
+        response_status: client_response.status_code,
+        response: client_response,
+        request: request,
+      )
+    else
+      raise "Client response is not avairable for record"
+    end
   end
 
   def initialize(headers_content : IO, body_content : IO, request : Request)
     header = JSON.parse(headers_content.gets_to_end)
     response_headers = HTTP::Headers.new
-    header["headers"].as_h.map do |k, v|
-      if k != "status"
+    header["headers"].as_h.reject do |k, _|
+      k == "status"
+    end.map do |k, v|
+      case v
+      when .as_s?
         response_headers[k] = v.as_s
+      when .as_a?
+        response_headers[k] = v.as_a.join(";")
+      else
+        # Do nothing
       end
     end
     Replay::Log.debug { "Recorded response headers: #{response_headers}" }
diff --git a/src/replay/http/request.cr b/src/replay/http/request.cr
index 10fa5cd..3951e8b 100644
--- a/src/replay/http/request.cr
+++ b/src/replay/http/request.cr
@@ -12,11 +12,14 @@ class HTTPRequest
   @params : Hash(String, String)
 
   def initialize(@http_request : HTTP::Request, @base_uri : URI)
-    base_uri.host.try do |host|
-      http_request.headers["Host"] = host
+    maybe_host = base_uri.host
+    if maybe_host
+      http_request.headers["Host"] = maybe_host
+      @host_name = maybe_host
+    else
+      raise "Request URI is collapsed : #{base_uri}"
     end
     @id = Random::Secure.hex
-    @host_name = base_uri.host.not_nil!
     @path = @http_request.path
     @method = @http_request.method
     @headers = @http_request.headers.to_h
@@ -45,7 +48,12 @@ class HTTPRequest
   )
     @id = id
     @base_uri = base_uri
-    @host_name = base_uri.host.not_nil!
+    maybe_host = base_uri.host
+    if maybe_host
+      @host_name = maybe_host
+    else
+      raise "Request URI is collapsed : #{base_uri}"
+    end
     @path = path
     @method = method
     @headers = headers