diff --git a/lib/rspec_api_documentation/client_base.rb b/lib/rspec_api_documentation/client_base.rb
index db0560a3..d7185e97 100644
--- a/lib/rspec_api_documentation/client_base.rb
+++ b/lib/rspec_api_documentation/client_base.rb
@@ -45,6 +45,8 @@ def process(method, path, params = {}, headers ={})
 
     def read_request_body
       input = last_request.env["rack.input"]
+
+      return '' unless input
       input.rewind
       input.read
     end
@@ -62,7 +64,7 @@ def document_example(method, path)
 
       request_metadata[:request_method] = method
       request_metadata[:request_path] = path
-      request_metadata[:request_body] = request_body.empty? ? nil : request_body.force_encoding("UTF-8")
+      request_metadata[:request_body] = request_body.force_encoding("UTF-8")
       request_metadata[:request_headers] = request_headers
       request_metadata[:request_query_parameters] = query_hash
       request_metadata[:request_content_type] = request_content_type