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ios里实现multipart/form-data格式上传文件。
http 请求（后面统一称为报文），包含请求头和请求体两部分，格式如下：
post / http/1.1 content-type:application/x-www-form-urlencoded accept-encoding: gzip, deflate host: w.sohu.com content-length: 21 connection: keep-alive cache-control: no-cache txt1=hello&txt2=world
objective-c 代码如下：
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// #define khttprequestheadcontenttypevaluemultipart @"multipart/form-data; boundary=forjoritest"
// #define khttprequestheadcontenttypekey @"content-type"
// #define khttprequestheadboundaryvalue @"forjoritest"
// #define khttprequestcontentdisposition @"content-disposition: form-data"
nsurlsessionconfiguration *configuration = [nsurlsessionconfiguration defaultsessionconfiguration];
nsurlsession *session = [nsurlsession sessionwithconfiguration:configuration];
nsurl *url = [nsurl urlwithstring:[kdetecturl stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]];
nsmutableurlrequest *mutablerequest = [nsmutableurlrequest requestwithurl:url];
mutablerequest.httpmethod = @"post";
[mutablerequest addvalue:khttprequestheadcontenttypevaluemultipart forhttpheaderfield:khttprequestheadcontenttypekey];
nsstring *body = [nsstring stringwithformat:@"--%@\r\n%@;name=\"%@\"\r\n\r\n%@", khttprequestheadboundaryvalue, khttprequestcontentdisposition, kuploadparamapikey, @"apikey"];
body = [body stringbyappendingstring:[nsstring stringwithformat:@"\r\n--%@\r\n%@; name=\"%@\"\r\n\r\napisecret", khttprequestheadboundaryvalue, khttprequestcontentdisposition, kuploadparamapisecret]];
body = [body stringbyappendingstring:[nsstring stringwithformat:@"\r\n--%@\r\n%@; name=\"%@\"\r\n\r\n1", khttprequestheadboundaryvalue, khttprequestcontentdisposition, @"return_landmark"]];
body = [body stringbyappendingstring:[nsstring stringwithformat:@"\r\n--%@\r\n%@; name=\"%@\"\r\n\r\ngender,age", khttprequestheadboundaryvalue, khttprequestcontentdisposition, @"return_attributes"]];
body = [body stringbyappendingstring:[nsstring stringwithformat:@"\r\n--%@\r\n%@; name=\"%@\"; filename=\"%@\" content-type=image/jpeg\r\n\r\n", khttprequestheadboundaryvalue, khttprequestcontentdisposition, kuploadparamimagefile, kuploadparamimagefile]];
nsmutabledata *data = [nsmutabledata data];
[data appenddata:[body datausingencoding:nsutf8stringencoding]];
[data appenddata:image];
[data appenddata:[[nsstring stringwithformat:@"\r\n--%@--\r\n", khttprequestheadboundaryvalue] datausingencoding:nsutf8stringencoding]];
mutablerequest.httpbody = data;
[mutablerequest setvalue:[nsstring stringwithformat:@"%lu", (unsigned long)data.length] forhttpheaderfield:@"content-length"];
nsurlsessionuploadtask *task = [session uploadtaskwithrequest:mutablerequest fromdata:nil completionhandler:^(nsdata * _nullable data, nsurlresponse * _nullable response, nserror * _nullable error) {
}];
[task resume];
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