paste url into terminal(urxvt, zsh) failed, some characters get escaped

In recent months, I find that if I copy the URL in Chrome and then Shift-Insert in the urxvt, the pasted URL is escaped. For example, the original URL is: http://example.com/?a=c the pasted content is: http://example.com/\?a\=c But if I paste it into other places, such as in the web browser or in the vim, there is no escape. What I use is Arch Linux, urxvt, zsh, oh-my-zsh.