How to Resolve Login Form Submission Issues with Jsoup by Incorporating VIEWSTATE and EVENTVALIDATION Values?

Resolving Login Form Submission Issues Using Jsoup

Despite submitting correct login credentials, the provided code fails to authenticate users and displays the login page, indicating potential implementation issues.

One essential aspect missing in the code is the inclusion of the VIEWSTATE and EVENTVALIDATION values. These values are required by the website for login and can be retrieved from the response of the initial GET request:

<code class="java">Document doc = loginForm.parse();
Element e = doc.select("input[id=__VIEWSTATE]").first();
String viewState = e.attr("value");
e = doc.select("input[id=__EVENTVALIDATION]").first();
String eventValidation = e.attr("value");</code>

Incorporating these values into the POST request along with the username and password ensures successful login:

<code class="java">org.jsoup.nodes.Document document = (org.jsoup.nodes.Document) Jsoup.connect("https://www.capitaliq.com/CIQDotNet/Login.aspx/authentication.php").userAgent("Mozilla/5.0")               
        .data("myLogin$myUsername", "MyUsername")
        .data("myLogin$myPassword, "MyPassword")
        .data("myLogin$myLoginButton.x", "22")                   
        .data("myLogin$myLoginButton.y", "8")
        .data("__VIEWSTATE", viewState)
        .data("__EVENTVALIDATION", eventValidation)
        .cookies(loginForm.cookies())
        .post();</code>

Moreover, adding the userAgent field to both GET and POST requests simulates a browser and ensures consistency with the response received on a manual login.

Optionally, the remember me field can be enabled by adding the following line to the POST request:

<code class="java">.data("myLogin$myEnableAutoLogin", "on")</code>

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