fix unixsocket when url contains colon

[willkan]

PR Checklist:

• I have run npm test locally and all tests are passing.
• I have added/updated tests for any new behavior.
  
• If this is a significant change, an issue has already been created where the problem / solution was discussed: [N/A, or add link to issue here]
  

PR Description

There is a bug when request unix url with search which contains :. This pr is expecting to fix this bug.

for example http://unix:/absolute/path/to/unix.socket:/request/path?x=a:b, will only send http://unix:/absolute/path/to/unix.socket:/request/path?x=a to the unix socket server

[willkan]

merge from the new master.

[willkan]

@mikeal could u check this pr and merge it if it is ok?