Request url contain special characters '[', ']'

[zzhouag]

If the url contains '[' or ']', the request will not be sent.

Compare to '{' in the url which will be encoded in '%7B', '[' will not be encoded.

Please help! Thank you!

[julio.batista]

Can you provide an example of how are you doing your request?
I made this example and worked fine
https://fiddle.sencha.com/#fiddle/2i

[Renan Cunha]

This happens because you are sending the literal characters.
Try to put it inside quotes '[]' like julio explain in this example and then parse it at the server side