See WebMock Issue #486.
When making a request and specifying headers as symbols, an exception is raised
in Net::HTTP:
bundle exec ruby demo.rb
/Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/header.rb:172:in `capitalize': undefined method `split' for :authorization:Symbol (NoMethodError)
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/header.rb:165:in `block in each_capitalized'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/header.rb:164:in `each'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/header.rb:164:in `each_capitalized'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/generic_request.rb:321:in `write_header'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http/generic_request.rb:136:in `exec'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1412:in `block in transport_request'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1411:in `catch'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1411:in `transport_request'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1384:in `request'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1377:in `block in request'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:853:in `start'
from /Users/cjlarose/.rbenv/versions/2.1.6/lib/ruby/2.1.0/net/http.rb:1375:in `request'
from /Users/cjlarose/dev/webmock-httparty-headers-bug/make_request.rb:16:in `make_request_net_http'
from demo.rb:3:in `<main>'
But, when stubbing the request with Webmock, no exception is raised:
bundle exec ruby -Itest headers_test.rb
Run options: --seed 61696
# Running tests:
.
Finished tests in 0.002222s, 450.0450 tests/s, 450.0450 assertions/s.
1 tests, 1 assertions, 0 failures, 0 errors, 0 skips