python - File upload - Bad request (400) -

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when try upload file via filefield of model using django administration following response django development server:

<h1>bad request (400)</h1>

the output in console is:

[21/jul/2013 17:55:23] "post /admin/core/post/add/ http/1.1" 400 26

i have tried find error log, after reading few answers here think there nothing because django prints debug info directly browser window when debug=true (my case).

how can debug problem further?

in case leading '/' character in models.py.

changed /products/ products/ in:

product_image = models.imagefield(upload_to='products/')


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