Rails - Jan 2009 - Upload via API leads to missing plus signs in HTTP-Body

Hi!

I''m developing a Rails-app that needs to take images from a separate
program. I managed to upload base64 encoded images via HTTP-Post-
Request (Cocoa), the HTTP-Body looks like (base64-data is shortened)
this:

"filename=Pic1.jpg&content_type=image/jpeg&data=/9j/4AAQSkZJRgABAQECeUJ
+woRAD/4gxYSU"

When I access the data via params[:data] in my controller, all the
plus signs are gone and substituted with spaces. I checked the
outgoing data of the separate program with a sniffer and it contains
the plus signs, so the substitution must take place somewhere on the
server.

Does anybody have an idea what causes this behaviour?

Thanks,
Thomas

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On Jan 22, 11:00 pm, TKAB
<tbil...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi!
>
> I''m developing a Rails-app that needs to take images from a
separate
> program. I managed to upload base64 encoded images via HTTP-Post-
> Request (Cocoa), the HTTP-Body looks like (base64-data is shortened)
> this:
>
>
"filename=Pic1.jpg&content_type=image/jpeg&data=/9j/4AAQSkZJRgABAQECeUJ
> +woRAD/4gxYSU"
>
> When I access the data via params[:data] in my controller, all the
> plus signs are gone and substituted with spaces. I checked the
> outgoing data of the separate program with a sniffer and it contains
> the plus signs, so the substitution must take place somewhere on the
> server.
The standards dictate that with application/x-www-form-urlencoded
data (the default; http://www.w3.org/TR/html401/interact/forms.html#h-17.13.3.3)
spaces are encoded by + signs, so the server is doing the correct
thing by turning them into spaces.

Fred
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Thank you very much, I was completely unaware of that.
So it would be a better idea to imitate a form upload and set the
Content-Type to multipart/form-data? Or is there any other way?

> The standards dictate that with application/x-www-form-urlencoded
> data (the
default;http://www.w3.org/TR/html401/interact/forms.html#h-17.13.3.3)
> spaces are encoded by + signs, so the server is doing the correct
> thing by turning them into spaces.
>
> Fred
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On 23 Jan 2009, at 08:18, TKAB wrote:
>
> Thank you very much, I was completely unaware of that.
> So it would be a better idea to imitate a form upload and set the
> Content-Type to multipart/form-data?
Certainly an option
> Or is there any other way?
>
You could replace + signs with what ever the correct % escape sequence  
is, but the multipart/form-data route is probably simpler.

Fred
>
>> The standards dictate that with application/x-www-form-urlencoded
>> data (the
default;http://www.w3.org/TR/html401/interact/forms.html#h-17.13.3.3)
>> spaces are encoded by + signs, so the server is doing the correct
>> thing by turning them into spaces.
>>
>> Fred
> >

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OK, I understand.

Thanks for your help!
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TKAB wrote:
> OK, I understand.
> 
> Thanks for your help!
http://en.wikipedia.org/wiki/Base64#URL_applications

This might help. See the section on an alternative base64 that is safe 
for URL encoding.
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