Looking for logging into the Postrequest site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Postrequest site. After that you can login as usual with your login credentials.
https://stackoverflow.com/questions/40723010/ionic-2-how-to-make-a-login-post-request
https://www.phpbb.com/community/viewtopic.php?t=2203836
https://discuss.jsonapi.org/t/how-to-handle-non-resource-post-request-and-response-like-session-login/1139
https://www.quora.com/How-does-a-POST-request-work
https://youtrack-support.jetbrains.com/hc/en-us/community/posts/206588815-How-to-form-a-proper-HTTP-POST-request-with-a-cookie-to-log-in-YouTrack-from-Java-application-
https://www.mediawiki.org/wiki/API:Login
https://www.toolsqa.com/postman/post-request-in-postman/
https://www.testingexcellence.com/rest-assured-post-request/
https://github.com/nextcloud/loginviapost
https://phabricator.wikimedia.org/T164402
https://github.community/t5/Project-Development-Help-and/Retrofit-2-login-post-request-returns-500-but-works-well-on/td-p/7134
https://codeforgeek.com/2014/09/handle-get-post-request-express-4/
https://www.techiediaries.com/ionic-http-post/