ios - Unexpectedly found nil while unwrapping an Optional value - NSMutableURLRequest -

when try run below code snippet works !

    let urlwithparams = "http://192.168.0.4:3003/manager/all"     let request = nsmutableurlrequest(url: nsurl(string: urlwithparams)!) 

but when string settings.bundle textfield below code doesn't work :

    let webserver:string = nsuserdefaults().stringforkey("priceweb")!     serverresponse.appendcontentsof(webserver)     serverresponse.appendcontentsof("/manager/all")     let request = nsmutableurlrequest(url: nsurl(string: serverresponse)!) 

when execute

print(webserver); 

the output http://192.168.0.4:3003 , when execute

print(serverresponse);  

the output http://192.168.0.4:3003/manager/all

but still error appears in following line:

let request = nsmutableurlrequest(url: nsurl(string: serverresponse)!) 

fatal error: unexpectedly found nil while unwrapping optional value

note : please provide answers in swift

you must encode url contains special characters.

try this

let urlwithparams = "http://192.168.0.4:3003/manager/all" let urlstr  = urlwithparams.stringbyaddingpercentescapesusingencoding(nsutf8stringencoding)!  // or use let urlstr = urlwithparams.stringbyaddingpercentencodingwithallowedcharacters(.urlq‌​ueryallowedcharacter‌​set()) let request = nsmutableurlrequest(url: nsurl(string: urlstr)!) 

for more reference see apple documents