android - Multipart request is getting error code 400 java -

i'm requesting web service in android using multipartutility , request sent is:

post / http/1.1 connection: keep-alive enctype: multipart/form-data content-type: multipart/form-data;charset=utf-8;boundary=--===1487292689114=== accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 accept-encoding: gzip, deflate, br accept-language: es-419,es;q=0.8,en-gb;q=0.6,en;q=0.4 cache-control: max-age=0 upgrade-insecure-requests: 1 user-agent: dalvik/1.6.0 (linux; u; android 4.4.4; 5042a build/ktu84p) host: 192.168.10.171:8080 content-length: 990 payload: ----===1487292689114=== content-disposition: form-data; name="new_id"  171 ----===1487292689114=== content-disposition: form-data; name="file"; filename="img_20170216_195118.jpg" content-type: image/jpeg content-transfer-encoding: binary  ���� ( ----===1487292689114===-- 

this service:

@post     @path("/reportnewimage")     @consumes(mediatype.multipart_form_data+"; charset=utf-8")     @produces(mediatype.text_plain)     public response setimage(             @formdataparam("new_id") string new_id,             @formdataparam("file") inputstream uploadedinputstream,             @formdataparam("file") formdatacontentdisposition filedetail, @context httpheaders headers) {         ...     } 

but i'm getting same error 400 bad requesting when connection made java android code. when make connection html form result successful. please me, reason?

edit:

request made using html form:

post / http/1.1 host: example.com connection: keep-alive content-length: 6564 cache-control: max-age=0 origin: http://localhost upgrade-insecure-requests: 1 user-agent: mozilla/5.0 (x11; linux x86_64) applewebkit/537.36 (khtml, gecko) ubuntu chromium/55.0.2883.87 chrome/55.0.2883.87 safari/537.36 content-type: multipart/form-data; boundary=----webkitformboundarynt8qjsidddgznij8 accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 referer: http://localhost/form.html accept-encoding: gzip, deflate, br accept-language: es-419,es;q=0.8,en-gb;q=0.6,en;q=0.4  ------webkitformboundarynt8qjsidddgznij8 content-disposition: form-data; name="new_id"  109 ------webkitformboundarynt8qjsidddgznij8 content-disposition: form-data; name="file"; filename="apple.jpg" content-type: image/jpeg  ����jfifhh��c ...                      �������1s�����k�"t�i)���ti6>�d ���� ------webkitformboundarynt8qjsidddgznij8-- 

and httpurlconnection android:

    url url = new url(requesturl);             httpconn = (httpurlconnection) url.openconnection();             httpconn.setrequestmethod("post");             httpconn.setusecaches(false);             httpconn.setdooutput(true); // indicates post method             httpconn.setdoinput(true);             httpconn.setrequestproperty("content-type",                     "multipart/form-data; boundary=" + boundary);             outputstream = httpconn.getoutputstream();             writer = new printwriter(new outputstreamwriter(outputstream, charset),                     true); writer.flush(); writer.close();         // checks server's status code first         int status = httpconn.getresponsecode();         if (status == httpurlconnection.http_ok) {             bufferedreader reader = new bufferedreader(new inputstreamreader(                     httpconn.getinputstream()));             string line = null;             while ((line = reader.readline()) != null) {                 response.append(line);             }             reader.close();             httpconn.disconnect();         } else {             throw new ioexception("server returned non-ok status: " + status);         } 

edit 2:

i've figured out error appears if line compiled:

httpconn.setrequestproperty("content-type",                         "multipart/form-data; boundary=" + boundary); 

else error code 415 because there no content-type header defined.

the problem boundary. found out in documentation boundary can composed group of characters:

the mandatory parameter multipart content-type boundary parameter, consists of 1 70 characters set of characters known robust through email gateways, , not ending white space. (if boundary appears end white space, white space must presumed have been added gateway, , should deleted.) formally specified following bnf:

boundary := 0*69 bcharsnospace

bchars := bcharsnospace / " "

bcharsnospace := digit / alpha / "'" / "(" / ")" / "+" / "_" / "," / "-" / "." / "/" / ":" / "=" / "?" reference

nevertheless, since removed "=" character began work fine.

old bundary: --===1487292689114===

new boundary: --x1487292689114x