File transfer with Apache2::Upload and XMLHttpRequest

File transfer with Apache2::Upload and XMLHttpRequest

am 28.07.2010 12:26:12 von Michael Wichmann

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I tried to switch from the 'common' way to send a file to the server, =
which is in my case:

a) define a form with an file-input-element:

enctype=3D"multipart/form-data">




b) define mod_perl code, that saves the file-data inside a handler, =
something like:

my $apr =3D Apache2::Request->new($r);
my $upload =3D $apr->upload('file');
....

That works fine as it is easy to work with $upload and save the data.
But I really can not figure out how to handle the XHR-Approach on the =
server-side because now, of cause, the 'file' param is missing.

The JS client side code is (where 'file' is a HTML5 File-Object):

var xhr =3D new XMLHttpRequest();
xhr.open("POST", url + "?filename=3D" + encodeURIComponent(file.name), =
true);
xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.send(file);

Any idea how now the server side part has to look like now?

Thanks, Michael=

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Content-Transfer-Encoding: quoted-printable
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charset=us-ascii

-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">
font-size: 12px; "> style=3D"font-family: verdana, geneva; "> transparent; "> rgb(0, 0, 0); "> I tried to switch from the 'common' way to send a =
file to the server, which is in my case:

a) define a form with an =
file-input-element:

class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; "><form method=3D"post" =
action=3D"gallery?action=3Dupload_image" =
enctype=3D"multipart/form-data"> style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">    <input =
type=3D"file" name=3D"file"/>
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">    <input =
type=3D"submit" value=3D"Submit" />
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; =
"></form>
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">b) define mod_perl code, that saves the file-data =
inside a handler, something like:
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">    my $apr =3D =
Apache2::Request->new($r);
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">    my $upload =3D =
$apr->upload('file');
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">    .... class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">That works fine as it is easy to =
work with $upload and save the data.
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; ">But I really =
can not figure out how to handle the XHR-Approach on the server-side =
because now, of cause, the 'file' param is missing.
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">The JS client side code is (where =
'file' is a HTML5 File-Object):
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">var xhr =3D new XMLHttpRequest();
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; =
">xhr.open("POST", url + "?filename=3D" + =
encodeURIComponent(
style=3D"font-family: verdana, geneva; font-size: 12px; "> href=3D"http://file.name/">file.name class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">), true);
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">xhr.setRequestHeader("Content-Type", =
"multipart/form-data");
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">xhr.send(file); class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">Any idea how now the server side =
part has to look like now?
style=3D"font-family: verdana, geneva; font-size: 12px; =
">
verdana, geneva; font-size: 12px; ">
class=3D"Apple-style-span" style=3D"font-family: verdana, geneva; =
font-size: 12px; ">Thanks, Michael
=

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Re: File transfer with Apache2::Upload and XMLHttpRequest

am 28.07.2010 13:49:50 von aw

Michael Wichmann wrote:
> I tried to switch from the 'common' way to send a file to the server, which is in my case:
>
> a) define a form with an file-input-element:
>
>


>
>
>

>
> b) define mod_perl code, that saves the file-data inside a handler, something like:
>
> my $apr = Apache2::Request->new($r);
> my $upload = $apr->upload('file');
> ....
>
> That works fine as it is easy to work with $upload and save the data.
> But I really can not figure out how to handle the XHR-Approach on the server-side because now, of cause, the 'file' param is missing.
>
> The JS client side code is (where 'file' is a HTML5 File-Object):
>
> var xhr = new XMLHttpRequest();
> xhr.open("POST", url + "?filename=" + encodeURIComponent(file.name), true);
> xhr.setRequestHeader("Content-Type", "multipart/form-data");
> xhr.send(file);
>
> Any idea how now the server side part has to look like now?
>
No, because your way of sending the file to the server does not match the Content-Type.
A multipart/form-data content type implies that the body of your POST should look like a
MIME message, where each part has its own set of headers and a body.
Here you are apparently just sending the file, as is.
It is a bit more complex than that.

Maybe search in Google for "ajax file upload" or something of the kind, to find a
javascript library that would do that ?