doc/go1.1.html, mime/multipart: document quoted-printable decoding
Fixes #5293
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8840043
diff --git a/doc/go1.1.html b/doc/go1.1.html
index 2900243..03a457d 100644
--- a/doc/go1.1.html
+++ b/doc/go1.1.html
@@ -862,6 +862,9 @@
<a href="/pkg/mime/multipart/#Writer"><code>Writer</code></a>,
<a href="/pkg/mime/multipart/#Writer.SetBoundary"><code>SetBoundary</code></a>,
to define the boundary separator used to package the output.
+The <a href="/pkg/mime/multipart/#Reader"><code>Reader</code></a> also now
+transparently decodes any <code>quoted-printable</code> parts and removes
+the <code>Content-Transfer-Encoding</code> header when doing so.
</li>
<li>
diff --git a/src/pkg/mime/multipart/multipart.go b/src/pkg/mime/multipart/multipart.go
index a6204d7..2c862a6 100644
--- a/src/pkg/mime/multipart/multipart.go
+++ b/src/pkg/mime/multipart/multipart.go
@@ -28,7 +28,12 @@
type Part struct {
// The headers of the body, if any, with the keys canonicalized
// in the same fashion that the Go http.Request headers are.
- // i.e. "foo-bar" changes case to "Foo-Bar"
+ // For example, "foo-bar" changes case to "Foo-Bar"
+ //
+ // As a special case, if the "Content-Transfer-Encoding" header
+ // has a value of "quoted-printable", that header is instead
+ // hidden from this map and the body is transparently decoded
+ // during Read calls.
Header textproto.MIMEHeader
buffer *bytes.Buffer
