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Add comments to explain difference between req.URL.Host and req.Host.

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This commit is contained in:
Haowei Cai 2017-10-23 15:48:11 -07:00
parent eff8136442
commit 4a5b9dd70e
1 changed files with 12 additions and 0 deletions
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12
staging/src/k8s.io/apimachinery/pkg/util/proxy/transport.go
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@ -139,6 +139,18 @@ func (t *Transport) rewriteURL(targetURL string, sourceURL *url.URL, sourceReque
return targetURL
}
// Example:
// When API server processes a proxy request to a service (e.g. /api/v1/namespace/foo/service/bar/proxy/),
// the sourceURL.Host (i.e. req.URL.Host) is the endpoint IP address of the service. The
// sourceRequestHost (i.e. req.Host) is the Host header that specifies the host on which the
// URL is sought, which can be different from sourceURL.Host. For example, if user sends the
// request through "kubectl proxy" locally (i.e. localhost:8001/api/v1/namespace/foo/service/bar/proxy/),
// sourceRequestHost is "localhost:8001".
//
// If the service's response URL contains non-empty host, and url.Host is equal to either sourceURL.Host
// or sourceRequestHost, we should not consider the returned URL to be a completely different host.
// It's the API server's responsibility to rewrite a same-host-and-absolute-path URL and append the
// necessary URL prefix (i.e. /api/v1/namespace/foo/service/bar/proxy/).
isDifferentHost := url.Host != "" && url.Host != sourceURL.Host && url.Host != sourceRequestHost
isRelative := !strings.HasPrefix(url.Path, "/")
if isDifferentHost || isRelative {