Crawlera outputs bytecode not html

a basic curl works fine and I get html back: 

curl "https://www.amazon.com"

When I request using proxy.crawlera.com then it returns a bytecode reponse:

curl -x proxy.crawlera.com:8010 -U <VALID API>: "https://www.amazon.com"

A sample of resulting bytecode:

?T]o?8}?W?~H??P2??v vfV?NGig?QTU?\?[Ș4??W???????k????????8??B??????8?

 a^J@?Ygg

 k??xU1?gy1{?0????G?=?%ñʓ??Q)???YTB?? a[s??7|@?نkTÃ?Yo?v??3??\.N??Fq*?C?[?m?\

 ?M?<t?|?f??9A??*.-"v(k???=????????˛??}?~??o??ԩ?ATk?^??h? R?#??+?z??{*b??BǕu.?*r7&?M,????m?Qɬ//??v?F??u>

7F????޶??c?*?ӬH?`Y??Η?pG???;???????g?Fxe]??JxU?x?g??uR?!7???.?}ߓ??i(3??F?,?k??3?U???%!?\???)_ͭ?0FPՍ?;?t؂x'}wӽR%?9co?O?~?1#??e??TUt?Np#RW????"?ԺЮ?

?  ????@qV$???H??yV??Xfu?b`>(?f?ԕ4??r???[ ??$

??N??+y??W_???ܶ????D1?4??ȇ?l[?a:}e=

 ?

?i`?rY?-?X???4??MHcGpl`?8?AD?@P`<????

Z ??X_?=+??9??q:?|z???PҾ??x?.?*F> ?);?w??O

 >?=??t???ry??4gøВ??o_????r|

B>u??1?Et??m???S?V?ks?֠???瞩?Ӱ?Wn@ox???4? ?J

 ????"[s?I?????_?N?.̼?I???

Any suggestions on what to try or do next?