http - ios multipart image upload, uploaded file is corrupted -

i making multipart post request server , works fine, jpeg i'm uploading doesn't have file extension , can't opened (the file size same orginal). i've tried on tho different servers , same error occured, i'm assuming it's issue of app code.

let boundary = generateboundarystring()     let request = nsmutableurlrequest(url: urls.sendfileurl)     request.httpmethod = "post"     request.setvalue("multipart/form-data; boundary=\(boundary)", forhttpheaderfield: "content-type")      let body = nsmutabledata()      (key, value) in params {         body.appendstring("--\(boundary)\r\n")         body.appendstring("content-disposition: form-data; name=\"\(key)\"\r\n\r\n")         body.appendstring("\(value)\r\n")     }       let imagedata: nsdata = uiimagejpegrepresentation(photo, 0.8)      body.appendstring("--\(boundary)\r\n")     body.appendstring("content-disposition: form-data; name=\"iosupload\"; filename=\"iosupload.jpg\"\r\n\r\n")     body.appendstring("content-type: image/jpeg\r\n\r\n")     body.appenddata(imagedata)     body.appendstring("\r\n")     body.appendstring("--\(boundary)\r\n")      request.httpbody = body 

i've tried post using posttestserver.com this result

i having similar problem: upload jpeg using multipart/form-data, , when re-download same file server can't opened preview.app, nor can used create instance of uiimage, because corrupted.

i opened both files side-by-side filemerge.app (included in xcode.app/contents/applications/) and, surprise, corrupted file had 1 empty line (crlf) @ top; otherwise, identical:

evidently, inserting \r\n just before append contents of file upload request's body.

i changed upload code this:

let body = nsmutabledata()  body.appendstring("--\(boundary)\r\n") body.appendstring("content-disposition: form-data; name=\"inputfile\"; filename=\"\(filename)\"\r\n") body.appendstring("content-type: image/jpeg\r\n\r\n\r\n") // !!!! 3 crlf body.appenddata(filedata)     body.appendstring("\r\n--\(boundary)--") 

...to this:

let body = nsmutabledata()  body.appendstring("--\(boundary)\r\n") body.appendstring("content-disposition: form-data; name=\"inputfile\"; filename=\"\(filename)\"\r\n") body.appendstring("content-type: image/jpeg\r\n\r\n") // !!!! 2 crlf body.appenddata(filedata)     body.appendstring("\r\n--\(boundary)--") 

...and downloaded file valid jpeg, identical 1 uploaded.

so suggest open both versions of file, side side, , see what's changed.

(filemerge complain "files not ascii.", ignore , proceed.)