http_response: reduce constants for 100 responses

Ruby 2.1 optimizes String#freeze by deduplicating string literal
calls to freeze.  Ruby 2.2 _may_ also optimize away allocations to
Hash#delete in the future.  In any case, this is uncommon code and
not worth trading permanent space to reduce temporal garbage.

While this favors Ruby 2.1 and later, it remains completely
compatible with Ruby 1.9.3 and 2.0.0.

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