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Feature: Update content_length header
When the `:update_content_length_header` option is set to a truthy value,
VCR will ensure that the `content-length` header will have the correct
value. This is useful in several situations:
- When you manually edit the cassette file and change the resonse body
length. You can use this option so you don't have to manually calculate
and update the body length.
- When you use ERB, the response body length may vary. This will ensure
it is always correct.
- Syck, the default YAML engine for ruby 1.8 (and 1.9, unless you compile
it to use Psych), has a bug where it sometimes will remove some
whitespace strings when you serialize them. This may cause the
`content-length` header to have the wrong value.
This is especially important when you use a client that checks the
`content-length` header. Mechanize, for example, will raise an `EOFError`
when the header value does not match the actual body length.
Background:
Given a previously recorded cassette file "cassettes/example.yml" with:
"""
---
- !ruby/struct:VCR::HTTPInteraction
request: !ruby/struct:VCR::Request
method: :get
uri: http://example.com:80/
body:
headers:
response: !ruby/struct:VCR::Response
status: !ruby/struct:VCR::ResponseStatus
code: 200
message: OK
headers:
content-type:
- text/html;charset=utf-8
content-length:
- "11"
body: Hello <modified>
http_version: "1.1"
"""
And a file named "common_stuff.rb" with:
"""
require 'vcr'
VCR.config do |c|
c.cassette_library_dir = 'cassettes'
c.stub_with :fakeweb
end
def make_request_and_print_results
response = Net::HTTP.get_response('example.com', '/')
puts "Body length: #{response.body.length}"
puts "Header value: #{response['content-length']}"
end
"""
Scenario: Default :update_content_length_header setting
Given a file named "default.rb" with:
"""
require 'common_stuff'
VCR.use_cassette('example', :record => :none) do
make_request_and_print_results
end
"""
When I run "ruby default.rb"
Then the output should contain:
"""
Body length: 16
Header value: 11
"""
Scenario: :update_content_length_header => false
Given a file named "false.rb" with:
"""
require 'common_stuff'
VCR.use_cassette('example', :record => :none, :update_content_length_header => false) do
make_request_and_print_results
end
"""
When I run "ruby false.rb"
Then the output should contain:
"""
Body length: 16
Header value: 11
"""
Scenario: :update_content_length_header => true
Given a file named "true.rb" with:
"""
require 'common_stuff'
VCR.use_cassette('example', :record => :none, :update_content_length_header => true) do
make_request_and_print_results
end
"""
When I run "ruby true.rb"
Then the output should contain:
"""
Body length: 16
Header value: 16
"""
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