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adjust the explanation why it is difficult to generate the header block of a final response immediately #353

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merged 1 commit into from May 30, 2017
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adjust the explanation why it is difficult to generate the header block of a final response immediately #353

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8 changes: 4 additions & 4 deletions draft-ietf-httpbis-early-hints.md
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Expand Up @@ -57,10 +57,10 @@ prior to their use; for example, rendering HTML by a Web browser. Having such li
the client as early as possible helps to minimize perceived latency.

The "preload" ([Preload]) link relation can be used to convey such links in the Link header field
of an HTTP response. However, it is not always possible for an origin server to generate a response
header block immediately after receiving a request. For example, the origin server might need to
query a database before generating a response, or it might delegate a request to an upstream HTTP
server running at a distant location.
of an HTTP response. However, it is not always possible for an origin server to generate the
header block of a final response immediately after receiving a request. For example, the origin
server might delegate a request to an upstream HTTP server running at a distant location, or the
status code might depend on the result of a database query.

The dilemma here is that even though it is preferable for an origin server to send some header fields as
soon as it receives a request, it cannot do so until the status code and the full header fields of the
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