- From: Charles Pritchard <chuck@jumis.com>
- Date: Wed, 31 Aug 2011 13:38:30 -0700
- To: Jonas Sicking <jonas@sicking.cc>
- CC: Glenn Maynard <glenn@zewt.org>, public-webapps@w3.org
On 8/31/2011 10:57 AM, Jonas Sicking wrote: > On Wed, Aug 31, 2011 at 10:19 AM, Glenn Maynard<glenn@zewt.org> wrote: >> On Wed, Aug 31, 2011 at 12:48 PM, Jonas Sicking<jonas@sicking.cc> wrote: >>>> Simple case: >>>> var callback = function(blob) { xhr.send(blob); }; >>>> formData.toBlob(callback, 'multipart/form-data'); >>>> >>>> Several services require signed messages in the http header, the >>>> scripting >>>> environment needs access to the blob data in order to sign the message >>>> body. >>> Neither multipart/form-data nor application/x-www-form-urlencoded >>> encoding is not slow, so there should be no need to make this an >>> asynchronous callback. >> Sorry if this doesn't make sense as I havn't been following this closely >> enough, but if the form contains a file, this will cause the file to be read >> from disk immediately, creating the encoded blob in memory, right? If it >> may trigger I/O, it should be async, regardless of how expensive the >> operation performed on the resulting data might be. >> >> (It may be possible for implementations to create a Blob class that >> generates the encoded form-data on demand, as async reads happen later on. >> But, even if that's possible for form-data, it won't necessarily be for >> other possible types passed to toBlob, eg. x-www-form-urlencoded.) > File attachments aren't submitted as part of > application/x-www-form-urlencoded encoding during form submission, so > I don't see why we should here. For multipart/form-data I think we > should always return a Blob which means that we wouldn't need to > actually read any contained blobs during encoding. A Blob is not necessarily a file attachment, it could simply be a large string. x-www-form-urlencoded would not serialize the mime type nor file name.
Received on Wednesday, 31 August 2011 20:38:59 UTC