cURL Simple File Upload - 417 Expectation Failed

Question

I have a problem with a simple file upload post with cURL... I did it so many times but in this case I always get "417 Expectation Failed" from server. When I try to post with my browser it works 100% but with cURL not.

That's my configuration:

My simple test form that works:

<form action="http://images.example.com/image_upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="userfile" size="50">
    <input type="submit" name="submit">
</form>

here the image_upload.php:

<?php
    $uploaddir = '/var/www/images.example.com/images/';
    $uploadfile = $uploaddir . basename($_FILES['userfile']['name']);
    if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {
        echo "File is valid, and was successfully uploaded.\n";
    } else {
        echo "Upload failed";
    }
?>

my cURL script (image_upload.sh) looks like this:

#!/bin/sh

file=$1

result=$(curl -s -L -F "userfile=@$file;type=application/octet-stream;" "http://images.example.com/image_upload.php")

echo $result

and here the server headers:

> POST /image_upload.php HTTP/1.1
> User-Agent: curl/7.18.2 (i486-pc-linux-gnu) libcurl/7.18.2 OpenSSL/0.9.8g zlib/1.1.4 libidn/1.8 libssh2/0.18
> Host: images.example.com
> Accept: */*
> Content-Length: 579
> Expect: 100-continue
> Content-Type: multipart/form-data; boundary=----------------------------e237975526cf
>
< HTTP/1.1 417 Expectation Failed
< Connection: close
< Content-Length: 0
< Date: Thu, 02 Feb 2012 21:29:22 GMT
< Server: lighttpd/1.4.19

I don't know where the error is, maybe you can recognize it.

Answer 1

add this to your lighttpd config: server.reject-expect-100-with-417 = "disable"

restart lighttpd. cheers :)

Answer 2

This happens when you are behind a proxy which is running in HTTP 1.1 mode where as the client is running in HTTP 1.0. In curl command line you can add --http1.0 in the arguments to solve the issue