Develop Reference

How to call Multipart message request in c#

I need to call an endpoint that requires the Request Header and Request Body with Content-type
and content-length and some other property as well which need to End with BOUNDARY.
Request Header
POST https://www.API-URL.com/ HTTP/1.1
Host: www.API-URL.com
Content-type: multipart/mixed; boundary=BOUNDARY
Content-length: 1034
Request Body
--BOUNDARY
Content-type: application/x-www-form-urlencoded
Content-length: 141
AppVersion=1.0&AcceptLicenseAgreement=Yes&ResponseType=application/x-x-pld&VersionNumber=xxx&UserId=xxxx&Password=xxxxx
--BOUNDARY
Content-type: application/x-x-binary
Content-length: 6
020020 // This the string Data which I need to post
--BOUNDARY--
How can I implement a call to this endpoint by using HttpClient?
Thanks in advance

Parse an content-type header from http request stream

I have the contents of an http request saved on disk.
It looks like this:
POST http://test.ca/ 1.1
Accept: application/xml
Content-Type: multipart/form-data; boundary="8942d141-7753-45ab-be3a-53021694e70c"
--8942d141-7753-45ab-be3a-53021694e70c
Content-Type: application/xml Content-Disposition: form-data; name=Bundle
...
--8942d141-7753-45ab-be3a-53021694e70c
Content-Type: image/jpg Content-Disposition: form-data; name="image 1 of 2"; filename=Attachment1.jpg; filename*=utf-8''Attachment1.jpg
...
--8942d141-7753-45ab-be3a-53021694e70c--
Normally, if you were processing this at the time of request, the HttpRequest object would be used to get the content type. If I have that request persisted to disk, are there any available classes I can use to handle parsing the ContentType for me?
Everything else can be parsed using the MultipartReader class, but I'm not aware of anything that will handle parsing the request header, given an instance of a stream. If I don't have to roll my own that would be great.

Parsing issue in WCF rest service

I am getting content-Type: text/plain; charset=UTF-8
Content-Length: 1
in the parsed value for multipart data
when parsing the data
I have used below parser class
https://bitbucket.org/lorenzopolidori/http-form-parser/src/a48defaac3b2c8a4b89152bffb8a2eb33ad57e53/HttpMultipartParser.cs?at=default
I have a key named user_id with value "3"
but when parsing I am seeing additional data (headers ) along with value "3"
Response is like this
content-Type: text/plain; charset=UTF-8
Content-Length: 1
Content-Transfer-Encoding: binary
3

Send POST request through WebClient with boundary

I have a problem with sending a POST request through WebClient in C# API.
The POST request is:
POST http://aaa.com/login.php HTTP/1.1
Host: www.aaa.com
Connection: keep-alive
Content-Length: 346
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Origin: http://www.aaa.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.152 Safari/537.22
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryK0J3zdRYpjgldAFy
Referer: http://www.turbotrafficbooster.com/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: bg-BG,bg;q=0.8
Accept-Charset: windows-1251,utf-8;q=0.7,*;q=0.3
Cookie: PHPSESSID=b703525853495c9257b3f3ec579c937a
------WebKitFormBoundaryK0J3zdRYpjgldAFy
Content-Disposition: form-data; name="navaction"
login
------WebKitFormBoundaryK0J3zdRYpjgldAFy
Content-Disposition: form-data; name="UserID"
test
------WebKitFormBoundaryK0J3zdRYpjgldAFy
Content-Disposition: form-data; name="Password"
test
------WebKitFormBoundaryK0J3zdRYpjgldAFy--
I know what to do with the headers like user-agent and etc., but I have a problem with the boundaries. I don't know how to put them and where to do it..

See this answer and the examples in the linked specification here. Example:
Content-Type: multipart/form-data; boundary=AaB03x
--AaB03x
Content-Disposition: form-data; name="submit-name"
Larry
--AaB03x
WebKitFormBoundaryK0J3zdRYpjgldAFy is just a convention. It could be MyFoobaredBoundry if you want, provided that that you declare and close it off appropriately. Different browsers use different strings, so nothing on the receiving end should differentiate because of it.
However, this is probably not something you have to do yourself...

HttpRequest.Files.Count is less than zero

HttpRequest.Saveas saves the following in a file
POST /VoicetrustAP/call.aspx HTTP/1.1
Cache-Control: max-age=3600, max-stale=0
Content-Length: 31988
Content-Type: multipart/form-data; boundary=osb_inet_multipart_boundary
Accept: */*
Expect: 100-continue
Host: 172.20.143.166
Referer: http://172.20.143.166/VoicetrustAP/call.aspx
User-Agent: AvayaVXI/2.0
--osb_inet_multipart_boundary
Content-Disposition: form-data; name="audioDataStream"; filename=20090313115600.ulaw
Content-Type: audio/x-wav
Content-Length: 31578
RIFFR{ WAVEfmt # # fact { data { ...data removed....
--osb_inet_multipart_boundary
Content-Disposition: form-data; name="callID"
00000056
--osb_inet_multipart_boundary
Content-Disposition: form-data; name="nextDialogID"
VTDC_CHECK_TD_AUDIO_DATA_ENR
--osb_inet_multipart_boundary--
But HttpRequest.Files.Count is less than zero ? Why?
Is it a bug in HttpRequest.Files?
Also I am able to access the data using formvariables. why?

I suspect although I haven't test it myself that a "less than zero" count actually means "I don't know how many files there are, I have received all of the incoming data stream yet".