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Note how to defer file descriptor creation/use a stream Ctor #454

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Note how to defer file descriptor creation/use a stream Ctor #454

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12 changes: 12 additions & 0 deletions Readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,9 @@ var form = new FormData();
form.append('my_field', 'my value');
form.append('my_buffer', new Buffer(10));
form.append('my_file', fs.createReadStream('/foo/bar.jpg'));
var streamCtor = (next) => next(fs.createReadStream('/foo/bar.jpg'));
streamCtor.path = '/foo/bar.jpg'
form.append('my_deferred_file', streamCtor)
```

Also you can use http-response stream:
Expand Down Expand Up @@ -216,6 +219,15 @@ form.append( 'my_file', fs.createReadStream('/foo/bar.jpg'), 'bar.jpg' );
form.append( 'my_file', fs.createReadStream('/foo/bar.jpg'), {filename: 'bar.jpg', contentType: 'image/jpeg', knownLength: 19806} );
```

If you need to upload many files and want to defer the creation of a file descriptor until read time, you can pass in a function with the [`next` callback as the first argument](https://github.com/felixge/node-combined-stream#usage). The function must have the `path` property of the fs.createReadStream, however.

```js
var streamCtor = (next) => next(fs.createReadStream('/foo/bar.jpg'));
streamCtor.path = '/foo/bar.jpg'

form.append('my_deferred_file', streamCtor)
```

#### _Headers_ getHeaders( [**Headers** _userHeaders_] )
This method adds the correct `content-type` header to the provided array of `userHeaders`.

Expand Down