Httpclient Cookie Issue

Question

Issue: I am trying to use httpclient for fetching data from a site.Now the site requires you to first visit a link then only you can post data to the next link. Link1 is a simple get request Link2 is a post request Now I think the site first store some cookie from the link1 and then only allow you to post data to link2 as whenever I try to open the link2 in incognito the site displays the error message "Session Timed out OR Maximum connections limit reached. Cannot Proceed Further. Please close and restart your browser " Now I have tried this:

 try
        {
            //Send the GET request
            httpResponse = await httpClient.GetAsync(new Uri(link1UriString));
            //Send the POSTrequest
             httpResponse = await httpClient.PostAsync(new Uri(link2uriString),postContent);                
            httpResponseBody = await httpResponse.Content.ReadAsStringAsync();

            }

But I am getting the session timed out error message. How to maintain cookies for a session in httpClient continuously received from the web.Like in python it can be done by

 opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookielib.CookieJar()))
 urllib2.install_opener(opener)

Link1
Link2

Is this VIT Wi-Fi :P. Also did you complete this? Im trying to do the same and need help :( — Rishav, Aug 18 '18 at 10:48

score 3 · Accepted Answer · answered Jan 11 '17 at 20:24

3

You can use a CookieContainer to handle cookies for you.
Doing so, you'd create the HttpClient like this.

using System.Net;
using System.Net.Http;

CookieContainer cookies = new CookieContainer();
HttpClientHandler handler = new HttpClientHandler();
handler.CookieContainer = cookies;
HttpClient httpClient = new HttpClient(handler);

httpResponse = await httpClient.GetAsync(new Uri(link1UriString));

(Note it uses the version of HttpClient in System.Net.Http)

answered Jan 11 '17 at 20:24

Matt Lacey

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Great, I forgot about `CookieContainer` :), Your answer more elegant – Andrii Krupka Jan 11 '17 at 20:26
Hey @Matt Kacey thanks for your answer.Now the data i need to post contains a integer and a string but the FormurlEncodedContent only accept string values any idea how to post this data using httpClinet.PostAsync() or by any other methods – Uwpbeginner Jan 12 '17 at 17:23
@Uwpbeginner does this answer not work for you http://stackoverflow.com/a/41620514/1755 – Matt Lacey Jan 12 '17 at 19:02
Thx,but I want use Web.http. – lindexi Jan 13 '17 at 04:54

score 1 · Answer 2 · answered Jan 11 '17 at 20:25

So, after first response you have Set-Cookie header:

var responseMessage = await httpClient.GetAsync("http://115.248.50.60/registration/Main.jsp?wispId=1&nasId=00:15:17:c8:09:b1");
IEnumerable<string> values;
var coockieHeader = string.Empty;
if (responseMessage.Headers.TryGetValues("set-cookie", out values))
{
    coockieHeader = string.Join(string.Empty, values);
}

After that, just setup your cookie into request message:

        var httpRequestMessage = new HttpRequestMessage
        {
            RequestUri = new Uri("http://115.248.50.60/registration/chooseAuth.do"),
            Content = postContent,
            Method = HttpMethod.Post
        };

        httpRequestMessage.Headers.Add("Cookie", values);
        var httpResponse = await httpClient.SendAsync(httpRequestMessage);

Hey @Andrii Krupka thanks for your answer but Matt's method was simpler to implement. — Uwpbeginner, Jan 13 '17 at 07:50

Httpclient Cookie Issue

2 Answers2