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Message-ID: <2918885.X1uCrcLdkc@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Wed, 03 Oct 2012 20:20:53 +0200
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Subject: Re: How to send file content to server?
Newsgroups: comp.lang.javascript
References: <50655c82$0$6892$e4fe514c@news2.news.xs4all.nl> <2953112.VveF1GjdCU@PointedEars.de> <5065817e$0$6883$e4fe514c@news2.news.xs4all.nl> <6300879.mfXoyHR8pD@PointedEars.de> <506a0d4c$0$6932$e4fe514c@news2.news.xs4all.nl> <1504793.Zb9mryafdB@PointedEars.de> <506c70ad$0$6930$e4fe514c@news2.news.xs4all.nl>
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Tom de Neef wrote:

> "Thomas 'PointedEars' Lahn" wrote:
> […] I need to get the html <form> submit alternative working because that
> _is_ the fall-back. And I could not get it to work.

Then you are doing something wrong server-side, or have not explained your 
goal in enough detail.
 
>>> So I played around with
>>> <form action="someID?event=fileUpload" method="POST"
>>>           enctype="multipart/form-data">
>>>    <input type="file" name="file">
>>>    <input type="submit">
>>> </form>
>>> 
>>> And it works: a true copy of the selected file ends up on the
>>> server. Ain't that marvellous!
>>
>> Of course.  That has worked at least since HTML 4.01 became a W3C
>> Recommendation (1999).
> 
> Still: marvellous !

:)
 
> The key problem:
>>> using the form submit, the connection will be terminated (gracefully)
>>> after the upload.
> 
> As you have responded: it should not !

Evidentially it *will not*.  Not with a HTTP/1.1 client.

> And I have failed to find the cause.

I wonder how you get the idea that the connection would be terminated in the 
first place.  ISTM you are confusing HTTP with TCP.  HTTP is stateless; TCP 
is not.

> But I have found a workaround: in the <form> element I now specify a
> hidden <iframe> as target. This may be amateuristic but it works and after
> ten days of experimenting I will leave it at that. (I blame the server
> software.)

If the server software remains unchanged, that alone should not make a 
difference.

> Thank you very much for your suggestions, corrections and pointers.
> A small piece of feedback for future references: in your post
> <http://stackoverflow.com/a/8378918/855543>
> where you describe the file upload script principles, I think that the
> argument to the XMLHttpRequest().send() call should be terminated with a
> nlcr

(Probably you mean CRLF.)

> and closing boundary string.

You are correct (see RFC 2046, section 5.1.1).  Fixed.


PointedEars
-- 
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee