retry: 500

data:123456789
data: 123456789123456789
data:123456789123456789123456789123456789
data:  123456789123456789123456789123456789123456789123456789123456789123456789
:some utf-8 characteres
data:çãá"'@`~Ý Ḿyyyy

:test if the character ":"(which is used for comments) isn't misunderstood
data:  :xxabcdefghij
data:çãá"'@`~Ý Ḿyyyy : zz