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http: document that Response.Body is non-nil
Fixes #2208 R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5011051
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@ -76,7 +76,12 @@ type readClose struct {
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// Do sends an HTTP request and returns an HTTP response, following
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// policy (e.g. redirects, cookies, auth) as configured on the client.
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//
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// Callers should close resp.Body when done reading from it.
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// A non-nil response always contains a non-nil resp.Body.
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//
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// Callers should close resp.Body when done reading from it. If
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// resp.Body is not closed, the Client's underlying RoundTripper
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// (typically Transport) may not be able to re-use a persistent TCP
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// connection to the server for a subsequent "keep-alive" request.
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//
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// Generally Get, Post, or PostForm will be used instead of Do.
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func (c *Client) Do(req *Request) (resp *Response, err os.Error) {
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@ -41,6 +41,10 @@ type Response struct {
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Header Header
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// Body represents the response body.
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//
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// The http Client and Transport guarantee that Body is always
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// non-nil, even on responses without a body or responses with
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// a zero-lengthed body.
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Body io.ReadCloser
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// ContentLength records the length of the associated content. The
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