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send early hints #1767

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Merged
merged 8 commits into from
Jun 29, 2018
Merged

send early hints #1767

merged 8 commits into from
Jun 29, 2018

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@i110
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@i110 i110 commented May 28, 2018 •
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This PR does 2 things:

  1. makes headers directives with when: early send 103 response before dispatching to the next handler
paths:
  /:
    headers.add:
      header:
        - "link: </index.js>; rel=preload"
        - "link: </style.css>; rel=preload"
      when: early
    file.dir: /path/to/doc_root
  1. with mruby, adds env['rack.early_hints']
paths:
  /:
    mruby.handler: |
      proc {|env|
        env['rack.early_hints'].call({'link' => "</index.js>; rel=preload\n</style.css>; rel=preload"})
        sleep 1
        [200, {}, ["hello"]]
      }

kazuho
kazuho reviewed May 29, 2018
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lib/handler/mruby.c Outdated
if (found == NULL)
found = end;
h2o_add_header_by_str(&generator->req->pool, &generator->req->res.headers, RSTRING_PTR(name), RSTRING_LEN(name), 1, NULL,
pos, found - pos);
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@kazuho kazuho May 29, 2018

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Am I correct in assuming that we already have code that handles \n for final responses? If yes, is the logic same as that for the final response? Is there a reason for not sharing the code?

Also, I believe that removing \n might be the correct solution here, see RFC 7230 section 3.2.4.

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@i110 i110 May 30, 2018

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@kazuho Thank you for the comment. I fixed it at e5f3a7b

Also, I believe that removing \n might be the correct solution here, see RFC 7230 section 3.2.4.

In Ruby web frameworks, \n is widely used to indicate the frameworks to send multiple headers with a same name at once.

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kazuho commented Jun 18, 2018

LGTM.

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kazuho commented Jun 29, 2018

@i110 Do you have any open issues regarding this PR? If not, please merge, then compose a new PR that updates the documentation. Thank you in advance.

@i110 i110 merged commit a3a0260 into master Jun 29, 2018
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@i110 @kazuho