I hope you're all well. I am trying to use C# and the request.post command to autofill a login page. I've shown the snippet of code I'm dealing with below.
My main concern currently is the 'POST DATA GOES HERE' .I'm unsure how I can gather the post-data as well as what syntax / format i would need to put it in.
I've already tried using Fiddler and Charles Proxy (HTTP Debuggers) to find anything about PostData . I did find some things I needed : User-Agent / Success Keys but those currently aren't relevant.
//Send a Post request to the (URL, postdata, contenttype) - store the HTTP Response into Response
var Response = Request.Post(LOGIN_URL, "{post data goes here}", "content type goes here `application/java`");
I am currently working on a OAuth2 implementation. However I am stuck on an Error 401. It seems like there is something wrong with my post request that is supposed to retrieve the access token from the Company the User logged in to. This is my code:
internal void RequestAccessToken(string code)
{
string requestBody = "grant_type="+ WebUtility.UrlEncode(GRANTTYPE)+ "&code=" + WebUtility.UrlEncode(code)+"&redirect_uri="+ WebUtility.UrlEncode(REDIRECT_URI);
WebClient client = new WebClient();
client.Headers.Add("Authorization",HeaderBase64Encode(CLIENT_ID, SECRETKEY));
var response = client.UploadString("https://thewebsiteiamcallingto.com/some/api", requestBody);
var responseString = client.OpenRead("https://thewebsiteiamcallingto.com/some/api");
}
My Questions are:
Is there anything wrong with the way I try to make the POST request ?
Is there a way to retrieve the whole string that is posted to the URI using UploadString?
P.S. I have seen this post regarding the POST creation. However I find the async part to be too complicated for my case.
Since we dont know the api documentation, I would suggest you to make a postman request and view the actual request sent and response received, and secondly make a request using your method and capture using a utility like wireshark and compare the difference.
I have a problem with sending data from ASP with the POST Method to a PHP page.
I would like to send mail with names. And since I live in Austria the names are in German and we have some Special characters. These characters don't arrive write.
I'm still pretty new to programming with C# btw. I had the Website before in Java-Script but I had to connect it with a database and therefore I switched to C# and now I'm like a "babe in the woods".
this.hdnDaten.Value = "ÄÖÜ|äöü|ß|é|#";
// mit POST versuchen
using (var client = new WebClient())
{
var postData = new System.Collections.Specialized.NameValueCollection();
postData.Add("von", this.hdnVon.Value);
postData.Add("an", this.hdnAn.Value);
postData.Add("betreff", this.hdnBetreff.Value);
postData.Add("daten", this.hdnDaten.Value);
byte[] response = client.UploadValues("http://xxxxxx.php", "POST", postData);
var responsebody = Encoding.UTF8.GetString(response);
}
And this is how the characters (in this.hdnDaten.Value) from above arrive in the mail-body:
ÄÖÜ|äöü|ß|é|#
Does anybody know what I can do to get the same characters in the end?
Edit 20143013: I think I have a clue: I have to encode the postData into ANSI (Codepage 1252). I tried do do this, but it doesn't work. Does anybody have an Idea how I could do this?
Edit 20140320: I don't even dare to give you the answer: I was looking all the time in the wrong place (somewhat like MH370): The problem was with the receiving side of the mail (I was using a POP3-Viewer for testing); when I downloaded the mail to Outlook everything was OK. The funny thing was that this didn't happen in the original (Javascript) Version that's why I was looking at the wrong place.
Thanks
Eddie
Try setting client.Encoding to UTF-8 before calling UploadValues. Also ensure that you read the text as UTF-8 on the server.
Try this.hdnDaten.Value = HttpUtility.UrlEncode("ÄÖÜ|äöü|ß|é|#"); on your post parameters.
on PHP you'll need to decode the parameters via html_entity_decode
What I want to be able to do: Edit HTTP Requests before they are sent off to the server
User navigates to a webpage of their choice in their browser > They encounter a request they wish to edit > they edit the request and then that gets sent to the server instead of the original one.
What I have done so far: I have captured the request, now I need help finding the code to edit it. Here is my code for capturing the request so far:
Fiddler.FiddlerApplication.BeforeRequest += sess =>
{
//Code to detect user specified URL here
}
Is it possible for me to edit the request before it is actually sent? If it can be done using the FiddlerCore API only then I'd be grateful, although I am willing to download more binaries if required.
Additional notes: I have tried streamwriters, binary writers, copy the respose into a memory stream edit it then copy it back, none of those methods work for me. Also when I try some methods my app just hangs and doesn't respond to things like pressing the X.
Maybe I'm just bad at explaining what I'm trying to achieve seems the only good answer I have has been about reponses :/
If the request reads the string "hello world" then I'd like the user to be able to change the REQUEST to say "hello there"
Such a noobish mistake I made, I thought that RequestBody was read only! Turns out I could have simply edited the response like this:
session.RequestBody = myBytes;
Really annoyed at myself for this!
In the demo app, adding the delegate is shown as:
Fiddler.FiddlerApplication.BeforeResponse += delegate(Fiddler.Session oS) {
// Console.WriteLine("{0}:HTTP {1} for {2}", oS.id, oS.responseCode, oS.fullUrl);
// Uncomment the following two statements to decompress/unchunk the
// HTTP response and subsequently modify any HTTP responses to replace
// instances of the word "Microsoft" with "Bayden". You MUST also
// set bBufferResponse = true inside the beforeREQUEST method above.
//
//oS.utilDecodeResponse(); oS.utilReplaceInResponse("Microsoft", "Bayden");
};
I need to redirect a user to http://www.someurl.com?id=2 using a POST method.
Is it possible? If yes, then how?
Right now I have following and it forwards the POST data properly, but it removes the ?id=2:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.someurl.com?id=2");
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postData.Length;
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(postData);
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
Response.Write(reader.ReadToEnd());
}
The reason I need both query string data -> ?id=2 and POST data is because I pass the query string to page in which javascript is going to be handling the query string data and .NET is going to work with data sent via POST method. The POST data that I am passing can be longer than maximum amount of characters that GET method allows, therefore I can't use only GET method... so, what are your suggestions?
More information:
I am writing a routing page, which adds some custom information to query string and then routes all of the data, old and new further to some URL that was provided. This page should be able to redirect to our server as well as to someone's server and it doesn't need to know where it came from or where it goes, it just simply needs to keep the same POST, GET and HEADER information as well as additional information received at this step.
No. There is no fathomable reason to mix POST and GET.
If you need to make parameters passed in with the request available to Javascript, simply POST them to the server, and have the server spit out the relevant information in a hidden field...
<input type="hidden" value="id=2,foo=bar" disabled="disabled" />
Simple as that.
Note: Disable the hidden field to exclude it from the subseqient POST, if there is one ;)
The problem i think that the problem could be that postData does not contain the id parameter as it is supplied through querystring.
Posted data is in the body of the request and querystring data is in the url.
You probably need to fetch the id from request.querystring to you postdata variable.
Given the extra information to your question, that you require to submit to an external source, what I believe you must do is process all of the data and return a form with hidden fields. Add some javascript to submit that form to the external URL immediately upon load. Note that you won't get file uploads this way, but you can appropriately handle POST and GET data.
As far as I know, it isn't possible to redirect with POST. Couldn't you simply pretend (internally handle as if) that the request was made to the page you want to redirect the user to?
The closest answer I've found to this problem is here, but it's not transparent to the user, therefore it's not good enough for me --> Response.Redirect with POST instead of Get?
If anybody has any other suggestions, please respond!
Try sending all of the data including the id in POST. Then when you are processing the data in C#, you can read the id variable in and write it back out to your webpage within a tag:
<script type="text/javascript">
id = <%=request_id%>
</script>
Then just make sure your javascript starts running after fully loaded with an onload() call and you're good to go.
What you are actually trying to do is redirect your POST data. May I ask why? I can't see any reason why you would want to do this if in fact both pages are on your servers.
What you should be doing is processing all of your POST data in script #1, and then redirecting to something like script2.aspx?id=234 where the ID 234 is in reference to the data in your database. You can then recall it later on script2 and dump all the data into Javascript variables for your client-side stuff to use.
Either way, something about this process sounds fishy to me. Mixing up your data processing client-side and server side is like mixing vodka and milk. It rarely works well. (But white russians sure are tasty!)
Actually I was able to achieve the desired result by mixing Javascript and Codebehind code. So, what I've done is in server side code I've built an entire web page like following:
var strForm = new StringBuilder();
strForm.Append("<form id=\"" + formId + "\" name=\"" + formId + "\" action=\"" + url + queryString +"\" method=\"POST\">");
foreach (string key in data)
{
strForm.Append("<input type=\"hidden\" name=\"" + key + "\" value=\"" + data[key].Replace("\"", """) + "\">");
}
strForm.Append("</form>");
And in addition to this form built on server side, I add a javascript code that submits the form I've just built.
var strScript = new StringBuilder();
strScript.Append("<script language='javascript'>");
strScript.Append("var v" + formId + " = document." + formId + ";");
strScript.Append("v" + formId + ".submit();");
strScript.Append("</script>");
strForm.Append("</form>");
So, what this code does, is as you see, the form action is an URL with query string parameters attached to it... but since the form method is POST, we submit the values we added as a hidden fields as POST parameters... So we end up submitting both POST and GET parameters.
Hope this solution will help somebody =)