NSURLErrorDomain Code=-1000 “bad URL”: What does it really mean?

问题

I have this confusing error. I am sending JSON through GET method and a website will parse and display the data. The problem is I am getting the error "NSURLErrorDomain Code -1000" or more simply "Bad URL". The thing is when I check the server, the data I sent is successfully parsed and displayed. So I am really confused why am I getting this "bad URL" error at all. Can anyone helped me out?

Here is the error I am receiving:

Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0xff73df0 {NSUnderlyingError=0xff73810 "bad URL", NSLocalizedDescription=bad URL}

EDIT:

http://sample.com/imwebjson.php?sid=5amp13&job=sendNotes&im_flds={\"im_uid\":"1",\"im_bookid\":"57",\"im_pagenr\":"1",\"im_notes\":"Testing%5C%5Cn"}

Ok you might ask why some parts of the JSON string is encoded already. These encoded parts are special characters. I realized that the stringByAddingPercentEscapesUsingEncoding is very incomplete. It doesn't encode all special characters, and what more is that when it encodes some special characters, the URL is not recognized at all. So I decided to manually encode the special characters into the string.

回答1:

The colon character : (at least, possibly others like " and {) needs to be percent encoded in URLs.

回答2:

In the GET parameters you have to change spaces " " for "%20"

来源：https://stackoverflow.com/questions/10782591/nsurlerrordomain-code-1000-bad-url-what-does-it-really-mean