How to Overcome Authentication Issues While Submitting Login Forms with Jsoup

Challenges Encountered in Submitting Login Forms with Jsoup

Despite entering valid login credentials, you may encounter difficulties accessing a site using the provided code. Upon execution, the code fails to authenticate, indicating a potential issue.

One possible oversight pertains to the requirement of additional values beyond username, password, and cookies. Specifically, the site necessitates the inclusion of VIEWSTATE and EVENTVALIDATION.

To address this, retrieve these values 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>

Incorporate these values into the subsequent POST request:

<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>

Include the userAgent field to ensure compatibility with the site's browser-specific rendering.

Enhancements

To activate the "remember me" feature during login:

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

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