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    Sometimes your system may display an error message that says the security permission for this page is not valid. There can be several reasons for this problem.

    I usually try to upload a file to an integrated SharePoint server. I have rtFa and FedAuth & requestDigest cookies and can authenticate successfully. However, when importing a file to SharePoint, I get an error

    security validation for this page is invalid

    -2130575251, System.Runtime.InteropServices.COMException The security clearance for this page may not be valid, click Back in web browser, refresh the page and try again.

    * int main ()

    CURL * c = curl_easy_init ();
    struct curl_slist shopping list = NULL;
    struct response res;
    init_response (& res);
    multitude = curl_slist_append (list, “Content type: text / plain”);
    list implies “X-RequestDigest: value”);
    curl_slist_append (list, list = curl_slist_append (list, “Cookie: rtFa = value; FedAuth = value”);
    curl_easy_setopt (c, CURLOPT_HTTPHEADER, list);
    curl_easy_setopt (c, CURLOPT_URL, https . (‘/Shared%20Documents’)/Files/Add(url=’DSsanjay.txt’,%20overwrite=true )”); < br> curl_easy_setopt (c, CURLOPT_POSTFIELDS, “This file contains details .. Recording …”);
    curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, writefunc);
    curl_easy_setopt (c, CURLOPT_WRITEDATA, & res); br> curl_easy_setopt (c, CURLOPT_VERBOSE, 1L);
    curl_easy_perform (c);

    security validation for this page is invalid

    > POST /teams/SharePointTest2/_api/web/GetFolderByServerRelativeUrl(‘/Shared%20Documents’)/Files/Add(url=’DSsanjay.txt’,%20overwrite=true) HTTP / 2
    Host: < name>
    accept: /
    content-type: text / regular
    x-requestdigest: value
    cookie: rtFa = value; FedAuth = value
    content length: 30
    Connection status changed (MAX_CONCURRENT_STREAMS == 100)!
    We have fully loaded and everything is fine
    connection # 0 to host .sharepoint.Left com intact
    exit means -2130575251, System.Runtime.InteropServices.COMException The prevention check for this page is invalid. Click “Back” for the visitor, refresh the page and try again. *

    I am trying to create a web trap where you just use a hotspot list. Unfortunately, the only way to do this is by accessing the API. So I called this API to create my own custom list web hook from my sharepoint site.

    I opened Dev Approaches in Chrome on one Sharepoint site and used each code:

      get ("'list-id')/subscriptions",  "Headings":"Accept": "app / json",    "content type": "app / json",  ,  "body": "" resource  ": " ('list-id')  ", " notificationUrl  ": " http: //  ", " expirationDateTime  ": " 2021-11-03T21: 54: 41.000  "",  "PUBLISH",); 


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      "method": "odata.error":        "Code": "-2130575251, Microsoft.SharePoint.SPException",        "Message":            "lang": "fr-FR",            "value": "The Home Protection check for this page is seriously invalid and could be damaged. Please use the back tab of your web browser to try again."             

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