Save reporting data to disk on HTTP failure

For debugging and support use

chef/lib/chef/resource_reporter.rb

@@ -187,17 +187,26 @@ class Chef
         Chef::Log.info("Sending resource update report (run-id: #{@run_id})")
         Chef::Log.debug run_data.inspect
         compressed_data = encode_gzip(run_data.to_json)
-        #if summary only is enabled send the uncompressed run_data excluding the run_data["resources"] and some additional metrics.
-        if @summary_only
-          run_data = report_summary(run_data, compressed_data)
-          Chef::Log.info("run_data_summary: #{run_data}")
-          @rest_client.post_rest(resource_history_url, run_data)
-        else
-          Chef::Log.debug("Sending Compressed Run Data...")
-          # Since we're posting compressed data we can not directly call
-          # post_rest which expects JSON
-          reporting_url = @rest_client.create_url(resource_history_url)
-          @rest_client.raw_http_request(:POST, reporting_url, {'Content-Encoding' => 'gzip'}, compressed_data)
+        begin
+          #if summary only is enabled send the uncompressed run_data excluding the run_data["resources"] and some additional metrics.
+          if @summary_only
+            run_data = report_summary(run_data, compressed_data)
+            Chef::Log.info("run_data_summary: #{run_data}")
+            @rest_client.post_rest(resource_history_url, run_data)
+          else
+            Chef::Log.debug("Sending compressed run data...")
+            # Since we're posting compressed data we can not directly call
+            # post_rest which expects JSON
+            reporting_url = @rest_client.create_url(resource_history_url)
+            @rest_client.raw_http_request(:POST, reporting_url, {'Content-Encoding' => 'gzip'}, compressed_data)
+          end
+        rescue Net::HTTPServerException => e
+          if e.response.code.to_s == "400"
+            Chef::FileCache.store("failed-reporting-data.json", Chef::JSONCompat.to_json_pretty(run_data), 0640)
+            Chef::Log.error("Failed to post reporting data to server (HTTP 400), saving to #{Chef::FileCache.load("failed-reporting-data.json", false)}")
+          else
+            Chef::Log.error("Failed to post reporting data to server (HTTP #{e.response.code.to_s})")
+          end
         end
       else
         Chef::Log.debug("Server doesn't support resource history, skipping resource report.")