Option to read fields first

Sorry to re-open an old one – but as mentioned in #43, there’s an issue when you want to process the fields of a form before you handle the file stream. Basically if the file field appears first in the upload form, you can’t read the fields until you resume() the stream.

Now let’s say I want to have a form like so:

        <input type="file" name='backupFile' accept=".tar"> Restore Backup
        <label>
        <input type="checkbox" value="drop" name="drop" checked='checked'>
          Drop Existing Data?
        </label>

AFAIK there’s no way currently to know whether I need to drop data before I pipe it to the restore handler; I’d need to move the checkbox above the file.

I prose a readFieldsFirst option to get around this.

[mscdex]

@jsdevtom That doesn’t work because you have to do something with that data (imagine a multi-GB file upload that comes before non-file fields). Typically that would involve buffering in memory or writing to permanent storage somewhere. That’s not the kind of decision busboy should be making.

It’s easier/more efficient to just re-arrange the fields on the client side.

[jsdevtom]

@mscdex Got it thanks