Si l'erreur que tu reçois est bien 302, la désactivation d'authentification va résoudre ton problème, mais si l'erreur HTTP est 404 ou 500, tu as des autres problèmes et je te conseille d'utiliser un outil comme Charles (charlesproxy.com) pour obtenir le texte de l'erreur exacte.
Bonne chance !
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I had the same issue with Uploadify throwing a "HTTP error" when uploading files in the CMS (Files & Images Tab).
The following solution solved my Problem:
1. Upgrading Uploadify and DataObjectManager to the latest revisions from github (https://github.com/unclecheese)
2. Doing a /dev/build/?flush=1
3. Turnning off mod_security by adding this to the .htacces of the Silverstripe root (/.htaccess):
# Turn off mod_security to prevent HTTP errors on Uploadify Module
@silverseba, that would work perfectly and does as long as your server is set up the same...but some of us have mod_security2 (version 2) which is suppose to me much better. Mod Sec 2 doesn't allow you to control (turn off) it from the htaccess file or any other config file.
I have a few other servers to move sites to, but if you have a client that has their own hosting and/or you have no control, then you are stuck with what ever version the host uses...so the solution needs to also find a way to work around mod_security2
I also receive a HTTP 500 error, wether I'm uploading via Files & Images or the image gallery module. As of now i have the latest releases vom Github on silverstripe 2.4.5. The files are uploaded successfully and appear in their destinated folder after I refresh the page. In the case of the image gallery they aren't added to the album although they reside in the albums folder.
The response sais the following:
GET http://localhost/ss245_new/admin/EditForm/field/GalleryItems/UploadifyForm/field/UploadedFiles/refresh?SecurityID=c509281361e2af655cdd81bbf8b199fbd0d1d961&ctf[GalleryItems][start]=0&ctf[GalleryItems][per_page]=10&ctf[GalleryItems][showall]=0&ctf[GalleryItems][sort]=SortOrder&ctf[GalleryItems][sort_dir]=&ctf[GalleryItems][search]=&ctf[GalleryItems][filter]=AlbumID_4&ctf[GalleryItems][view]=grid&ctf[GalleryItems][imagesize]=100&FileIDs=%EF%BB%BF300 500 (Error: "Couldn't run query: SELECT "File"."ClassName", "File"."Created", "File"."LastEdited", "File"."Name", "File"."Title", "File"."Filename", "File"."Content", "File"."Sort", "File"."SortOrder", "File"."ParentID", "File"."OwnerID", "File"."ID", CASE WHEN "File"."ClassName" IS NOT NULL THEN "File"."ClassName" ELSE 'File' END AS "RecordClassName" FROM "File" WHERE (`File`.ID IN (300)) ORDER BY "SortOrder" ASC Unknown column '300' in 'where clause'" at line 525 of D:\xampp\htdocs\ss245_new\sapphire\core\model\MySQLDatabase.php)
[EDIT] Some further information. I've copied the query to the commandline client and I have there appears an ? before the numerical ID. Could this be some "invisible" unicode character? Loading into a hex editor shows the following character codes in front of the ID: ef bb bf