WinRT HttpClient，POST请求

Question

I'm trying to send the POST request below in a WinRT App.

This is the code i use:

var pairs = new List<KeyValuePair<string, string>>
{
  new KeyValuePair<string, string>("MinOraPart", "01:00"),
  new KeyValuePair<string, string>("MaxOraPart", "23:59"),
  new KeyValuePair<string, string>("TIPOVIS", "FERMATE"),
  new KeyValuePair<string, string>("CAMBIOCOMUNE", "0"),
  new KeyValuePair<string, string>("DescLocPart", "PADOVA AUTOSTAZIONE"),
  new KeyValuePair<string, string>("DescLocDest", "ROVIGO AUTOSTAZIONE"),
  new KeyValuePair<string, string>("direzione", "ANDATA"),
  new KeyValuePair<string, string>("gg", ""),
  new KeyValuePair<string, string>("meseanno", ""),
  new KeyValuePair<string, string>("ControlloEsisteFermata", "0"),
  new KeyValuePair<string, string>("PARTENZA", ""),
  new KeyValuePair<string, string>("LocPartenza", "348|PADOVA AUTOSTAZIONE|0"),
  new KeyValuePair<string, string>("ARRIVO", ""),
  new KeyValuePair<string, string>("LocArrivo", "453|ROVIGO AUTOSTAZIONE|0"),
  new KeyValuePair<string, string>("dataViaggio", "14/11/2013"),
  new KeyValuePair<string, string>("OREDalSol", "01:00"),
  new KeyValuePair<string, string>("OREAlSol", "23:59"),
  new KeyValuePair<string, string>("fascia", "libera"),
  new KeyValuePair<string, string>("ordine", "NumCambi, OraPart"),
  new KeyValuePair<string, string>("MaxNodi", "1"),
  new KeyValuePair<string, string>("MinimoV", "0"),
  new KeyValuePair<string, string>("CERCA_ANDATA", "corse di ANDATA")
}
var content = new StringContent(pairs);
content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
var client = new HttpClient();
var response = await client.PostAsync("http://ro.autobus.it/ro/asp/RicercaOrari.asp?User=SITA", content);
if (response.IsSuccessStatusCode)
{
    //Extract the data from the webpage
}

It works since i get the HTML code from the server, but the page i recive doesn't contain the query result, it's just the search page without the results.

It seems that miss something in the request, any suggestion?

Answer 1

You are missing to convert that array of pairs into a percent-encoded string . Unfortunately, there is no NameValueCollection class in WinRT. But it is not too hard to make an equivalent function. Eg:

private string ToPercentEncoding(List<KeyValuePair<string, string>> pairs)
{
    List<string> joinedPairs = new List<string>();
    foreach (var pair in pairs)
    {
        joinedPairs.Add(
            System.Net.WebUtility.UrlEncode(pair.Key) +
            "=" +
            System.Net.WebUtility.UrlEncode(pair.Value));
    }

    return String.Join("&", joinedPairs);
}

Then, just call the function from your code and pass the result to the StringContent class:

private async void Foo(){
    var pairs = new List<KeyValuePair<string, string>>
    {
        new KeyValuePair<string, string>("MinOraPart", "01:00"),
        new KeyValuePair<string, string>("MaxOraPart", "23:59"),
        new KeyValuePair<string, string>("TIPOVIS", "FERMATE"),
        new KeyValuePair<string, string>("CAMBIOCOMUNE", "0"),
        new KeyValuePair<string, string>("DescLocPart", "PADOVA AUTOSTAZIONE"),
        new KeyValuePair<string, string>("DescLocDest", "ROVIGO AUTOSTAZIONE"),
        new KeyValuePair<string, string>("direzione", "ANDATA"),
        new KeyValuePair<string, string>("gg", ""),
        new KeyValuePair<string, string>("meseanno", ""),
        new KeyValuePair<string, string>("ControlloEsisteFermata", "0"),
        new KeyValuePair<string, string>("PARTENZA", ""),
        new KeyValuePair<string, string>("LocPartenza", "348|PADOVA AUTOSTAZIONE|0"),
        new KeyValuePair<string, string>("ARRIVO", ""),
        new KeyValuePair<string, string>("LocArrivo", "453|ROVIGO AUTOSTAZIONE|0"),
        new KeyValuePair<string, string>("dataViaggio", "14/11/2013"),
        new KeyValuePair<string, string>("OREDalSol", "01:00"),
        new KeyValuePair<string, string>("OREAlSol", "23:59"),
        new KeyValuePair<string, string>("fascia", "libera"),
        new KeyValuePair<string, string>("ordine", "NumCambi, OraPart"),
        new KeyValuePair<string, string>("MaxNodi", "1"),
        new KeyValuePair<string, string>("MinimoV", "0"),
        new KeyValuePair<string, string>("CERCA_ANDATA", "corse di ANDATA")
    };

    var content = new StringContent(ToPercentEncoding(pairs));
    content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
    var client = new HttpClient();
    var response = await client.PostAsync("http://localhost", content);
    if (response.IsSuccessStatusCode)
    {
        //Extract the data from the webpage.
    }
}

And that's all, the rest of your code works as expected.

UPDATE:

Some of your keys are wrong, it is DesLocDest and not DescLocDest .

You will definitely need to set the cookie, at least the one starting with ASPSESSIONId... .

If that's not enough, try setting the User-Agent and Origin headers.