recreate this web request in vb net - vb.net

Question

i?m trying to make automatic image set in pinterest account with WebClient.
I'd like to recreate this http request:
(Request-Line) POST /upload-image/?img=Desert.jpg HTTP/1.1
Host www.pinterest.com
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0
Accept text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding gzip, deflate
X-Requested-With XMLHttpRequest
X-File-Name Desert.jpg
Cache-Control no-cache
X-CSRFToken RqwJCawJyAGYIZfzob51qxrEGj4GJcSA
Referer https://www.pinterest.com
Content-Length 846128
Content-Type multipart/form-data; boundary=---------------------------5431268530037
Cookie _pinterest_cm=TWc9PSY1YlkwcmtVRGlNRzRQZXpiZXJseVl6TnFHYnEvZlhpNDZPcExCQnhKN3UvdUUveWI0c3p4bWJKUmhoZy9YRG9sS3dNZTZFSFNhN2V3VWhJM1JkbUlxbC92VjhHUGFldlRTVVJTNlA1L1M0SDE5QXhLcHVWS2ZrSUh3NTN2ODA0WSZ5dnpJQkVRUmx5TVJGTEdmQm5EVmRGQXNqbDQ9; csrftoken=RqwJCawJyAGYIZfzob51qxrEGj4GJcSA; _pinterest_sess="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"; sessionFunnelEventLogged=1; __utma=229774877.448600758.1436737610.1436739423.1436745191.3; __utmz=229774877.1436737610.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); c_dpr=1; __utmc=229774877; _b="ARLbRMvYKUdKiaBWDA2Oxko87z7iIN4MuGnJALvZK8vehgzT11AKeoa13PH4l9VjVMU="; _pinterest_pfob=disabled; __utmb=229774877.3.9.1436745219732; __utmt=1
Connection keep-alive
Pragma no-cache
I have try this code, but i can't obtain Content-Length and Content-Type.
Dim wc As New WebClient
wc.UseDefaultCredentials = True
wc.Credentials = New NetworkCredential("pippomio#yahoo.com", "88Y71nR3764")
wc.Headers.Add("Host", "www.pinterest.com")
wc.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5")
wc.Headers.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
wc.Headers.Add("Accept-Language", "it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3")
wc.Headers.Add("Accept-Encoding", "gzip, deflate")
wc.Headers.Add("X-Requested-With", "XMLHttpRequest")
wc.Headers.Add("X-Requested-With", "XMLHttpRequest")
wc.Headers.Add("X-File-Name", "Hydrangeas.jpg")
wc.Headers.Add("Cache-Control", "no-cache")
wc.Headers.Add("X-CSRFToken", token)
wc.Headers.Add("Referer", "https://www.pinterest.com")
wc.Headers.Add("Connection", "keep-alive")
wc.Headers.Add("Pragma", "no - cache")
Dim Response As Byte() = wc.UploadFile("https://www.pinterest.com/upload-image/?img=Hydrangeas.jpg", "POST", "Hydrangeas.jpg")
In wich way can I do this request in vb net?
Thanks

Answer 1

First, I recommend you to check this and this tutorial to learn how to send/receive HTTP requests on correct way.
Second, you should not re-do any web browser actions in your program since it is usually not a good practice as the frontend architecture should be subject an unexpected change any time. Instead of this, you should check Pinterest API, especially the Users API which can help you to achieve your plans. Usually API interfaces are not a subject of random changes, they are more reliable than replaying front-end operations and more stable, has more capabilities to the load.
(Pinterest API seems working only from Firefox, if you get an empty area at right side with a big "None" text, then browse the link from Firefox - it seems can handle the page)