oauth - DotNetOpenAuth Bad Request on ProcessUserAuthorization -

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i'm implementing sso process (oauth 2.0) using dotnetopenauth example. solution has 3 projects (client web, authorization server, , resource server) got issue in step of processing user authorization response after authorization server returned authorization code client.

http://localhost/oauthclient/samplewcf2.aspx?code=xxx&state=l6saxlxhlxwsbrctck3iaw

exception is:

[webexception: remote server returned error: (400) bad request.]    system.net.httpwebrequest.getresponse() +8765848    dotnetopenauth.messaging.standardwebrequesthandler.getresponse(httpwebrequest request, directwebrequestoptions options) +271  [protocolexception: error occurred while sending direct message or getting response.]    dotnetopenauth.messaging.standardwebrequesthandler.getresponse(httpwebrequest request, directwebrequestoptions options) +2261    dotnetopenauth.messaging.channel.requestcore(idirectedprotocolmessage request) +516    dotnetopenauth.messaging.channel.request(idirectedprotocolmessage requestmessage) +138    dotnetopenauth.oauth2.clientbase.updateauthorizationwithresponse(iauthorizationstate authorizationstate, enduserauthorizationsuccessauthcoderesponse authorizationsuccess) +210    dotnetopenauth.oauth2.webserverclient.processuserauthorization(httprequestbase request) +904    oauthclient.samplewcf2.page_load(object sender, eventargs e) +118    system.web.ui.control.loadrecursive() +71    system.web.ui.page.processrequestmain(boolean includestagesbeforeasyncpoint, boolean includestagesafterasyncpoint) +3178

here's code:

protected void page_load(object sender, eventargs e) {             if (!ispostback) {                 // check see if we're receiving end user authorization response.                 var authorization = client.processuserauthorization();                                 //temp                 if (authorization != null)                 {                     // receiving authorization response.  store , associate user.                     authorization = authorization;                     response.redirect(request.path); // rid of /?code= parameter                 }             }              if (authorization != null) {                 // indicate user have obtained authorization on of these.                 foreach (var li in this.scopelist.items.oftype<listitem>().where(li => authorization.scope.contains(li.value))) {                     li.selected = true;                 }                 this.authorizationlabel.text = "authorization received!";                 if (authorization.accesstokenexpirationutc.hasvalue) {                     timespan timeleft = authorization.accesstokenexpirationutc.value - datetime.utcnow;                     this.authorizationlabel.text += string.format(cultureinfo.currentculture, "  (access token expires in {0} minutes)", math.round(timeleft.totalminutes, 1));                 }             }              this.getnamebutton.enabled = this.getagebutton.enabled = this.getfavoritesites.enabled = authorization != null;         }


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