Bump to new version

src/details/Gemfile

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+
+gem "webrick", "~> 1.8"

src/details/README.md

@@ -5,5 +5,6 @@
 * Ruby 2.7
 
 ```bash
+bundle install
 ruby details.rb 9080
 ```

src/details/details.rb

@@ -1,6 +1,6 @@
 #!/usr/bin/ruby
 #
-# Copyright 2017 Istio Authors
+# Copyright Istio Authors
 #
 #   Licensed under the Apache License, Version 2.0 (the "License");
 #   you may not use this file except in compliance with the License.
@@ -129,17 +129,61 @@ def get_isbn(book, isbn_type)
 
 def get_forward_headers(request)
   headers = {}
-  incoming_headers = [ 'x-request-id',
-                       'x-b3-traceid',
-                       'x-b3-spanid',
-                       'x-b3-parentspanid',
-                       'x-b3-sampled',
-                       'x-b3-flags',
-                       'x-ot-span-context',
-                       'x-datadog-trace-id',
-                       'x-datadog-parent-id',
-                       'x-datadog-sampled'
-                     ]
+
+  # Keep this in sync with the headers in productpage and reviews.
+  incoming_headers = [
+      # All applications should propagate x-request-id. This header is
+      # included in access log statements and is used for consistent trace
+      # sampling and log sampling decisions in Istio.
+      'x-request-id',
+
+      # Lightstep tracing header. Propagate this if you use lightstep tracing
+      # in Istio (see
+      # https://istio.io/latest/docs/tasks/observability/distributed-tracing/lightstep/)
+      # Note: this should probably be changed to use B3 or W3C TRACE_CONTEXT.
+      # Lightstep recommends using B3 or TRACE_CONTEXT and most application
+      # libraries from lightstep do not support x-ot-span-context.
+      'x-ot-span-context',
+
+      # Datadog tracing header. Propagate these headers if you use Datadog
+      # tracing.
+      'x-datadog-trace-id',
+      'x-datadog-parent-id',
+      'x-datadog-sampling-priority',
+
+      # W3C Trace Context. Compatible with OpenCensusAgent and Stackdriver Istio
+      # configurations.
+      'traceparent',
+      'tracestate',
+
+      # Cloud trace context. Compatible with OpenCensusAgent and Stackdriver Istio
+      # configurations.
+      'x-cloud-trace-context',
+
+      # Grpc binary trace context. Compatible with OpenCensusAgent nad
+      # Stackdriver Istio configurations.
+      'grpc-trace-bin',
+
+      # b3 trace headers. Compatible with Zipkin, OpenCensusAgent, and
+      # Stackdriver Istio configurations.
+      'x-b3-traceid',
+      'x-b3-spanid',
+      'x-b3-parentspanid',
+      'x-b3-sampled',
+      'x-b3-flags',
+
+      # SkyWalking trace headers.
+      'sw8',
+
+      # Application-specific headers to forward.
+      'end-user',
+      'user-agent',
+
+      # Context and session specific headers
+      'cookie',
+      'authorization',
+      'jwt'
+  ]
 
   request.each do |header, value|
     if incoming_headers.include? header then