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Contents
# frozen_string_literal: false
require_relative '../../../distributed/fetcher'
module Datadog
module Tracing
module Contrib
module HTTP
module Distributed
# Retrieves HTTP headers from carrier.
# Headers will also match if Rack-formatted:
# 'my-header' will match 'my-header' and 'HTTP_MY_HEADER'.
#
# In case both variants are present, the verbatim match will be used.
class Fetcher < Tracing::Distributed::Fetcher
# DEV: Should we try to parse both verbatim an Rack-formatted headers,
# DEV: given Rack-formatted is the most common format in Ruby?
def [](name)
# Try to fetch with the plain key
value = super(name)
return value if value && !value.empty?
# If not found, try the Rack-formatted key
rack_header = "HTTP-#{name}"
rack_header.upcase!
rack_header.tr!('-'.freeze, '_'.freeze)
hdr = super(rack_header)
# Only return the value if it is not an empty string
hdr if hdr != ''
end
end
end
end
end
end
end
Version data entries
17 entries across 17 versions & 1 rubygems