- From: Glenn Maynard <glenn@zewt.org>
- Date: Wed, 9 Feb 2011 23:21:06 -0500
- To: Jonas Sicking <jonas@sicking.cc>
- Cc: ben turner <bent.mozilla@gmail.com>, Jeremy Orlow <jorlow@chromium.org>, Cameron McCormack <cam@mcc.id.au>, public-webapps WG <public-webapps@w3.org>
- Message-ID: <AANLkTim5CrGczaw8N9mVS5ZVXeX6kgHy3UTOpw0emJDu@mail.gmail.com>
On Wed, Feb 9, 2011 at 9:46 PM, Jonas Sicking <jonas@sicking.cc> wrote: > > - Some errors are implementation-specific. For example, if "internal > error" > > is caused by SQLite under the hood returning an unexpected error that the > > browser can't recover from, the browser could include the SQLite error > > message. That's not something that should be specced specifically, but > it > > may be very helpful on the developer's side to knowing what went wrong on > a > > user's system to be able to follow up the problem. Similarly, if a > File-API > > write fails due to EDQUOT because of the user's hard disk quota (not to > be > > confused with the browser's quota), receiving strerror(EDQUOT) as part of > > the message would be very useful, but shouldn't be laid out as a specific > > error code in the spec. > > Note that in both these cases the browser probably doesn't want to > forward the message it gets from the OS or from SQLite directly to the > webpage. Such a message can contain sensitive information such as > usernames and filenames. > Right; it's the implementation's job to pay attention to where its messages are coming from. For example, you shouldn't blindly forward an error message string from a database backend (which may include paths). However, returning a stringification of SQLITE_* constants or strerror(errno), seems perfectly safe and very useful. > - Some errors contain other information that may not be > > implementation-specific, but may not be worth codifying into the spec. > For > > example, it's not worth trying to encode an error message for every > possible > > Regex parsing failure. Browsers may also give additional information > that's > > not useful to spec; for example, "17" in "open parentheses at pos 17 not > > closed". Javascript parsing failures might include the context of a > > compilation error. > > This is more interesting, but I'm not sure that it applies to abort > codes? The one case I can think of is unhandled errors which result in > an abort. However in that case we should have already fired > window.onerror with the information you're talking about. > I was looking over the spec on success and error events some more while considering this, and I'm deeply confused: 3.2.2 describes the success and error events being fired at the Window ("at each Window object") rather then at the request, which seems bizarre. I feel like this is an embarrassing spec-novice question, but could someone clue me in on what's happening here? -- Glenn Maynard
Received on Thursday, 10 February 2011 04:21:40 UTC