Below are 4 forms. Each one utilizes a different "enctype" attribute on the form.
Sample Result:
test_field_1=Test&test_field_2=%21%40%23%24%25%5E%26*%28%29_%2B-%3D
Sample Result:
test_field_1=Test
test_field_2=!@#$%^&*()_+-=
Sample Result:
test_field_1=Test&test_field_2=%21%40%23%24%25%5E%26*%28%29_%2B-%3D
Sample Result:
-----------------------------21204402826745
Content-Disposition: form-data; name="test_field_1"
Test
-----------------------------21204402826745
Content-Disposition: form-data; name="test_field_2"
!@#$%^&*()_+-=
-----------------------------21204402826745--