Pushes: support a x-http2-push-only attribute #1169
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When this is set, H2O will interpret the `rel=preload` link as a header we only want to use for H2 pushes, rather than something we also want to push to the client. So we'll be removing that attribute from the link header. If there's only one link, we remove the full header. This is change is there to allow HTTP/1 clients to express HTTP/2 pushes in a way that doesn't affect the response sent to the client.
kazuho
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Jan 18, 2017
lib/core/util.c
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| if (!nopush && preload) | ||
| push_one_path(pool, &paths_to_push, &url, base_path, input_scheme, input_authority, base_scheme, base_authority); | ||
| } while (token != NULL); |
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How about doing the parsing and the rebuilding of filtered_value in one pas?
I suggest this because it wouldn't be too difficult to retain the start and end of each link element, and use it to build filtered value at the end of this do-while loop.
The start of the element can be calculated as url.base - 1 (or you might want to retain url with the surrounding brackets until passing the value to push_one_path).
The end of the element can be calculated as token != NULL ? token : value + value_len.
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Thank you for your feedback. 83ba870 has a version that does the transform in a single pass. |
An improvement suggested by Kazuho: try to have the best of both worlds: we only allocate from the pool if we know we're going to filter values, otherwise, we don't allocate anything.
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kazuho
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Jan 20, 2017
Pushes: support a x-http2-push-only attribute
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Thank you for the changes! Merged with small fixes. |
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When this is set, H2O will interpret the
rel=preloadlink as a headerwe only want to use for H2 pushes, rather than something we also want to
push to the client. So we'll be removing that attribute from the link
header. If there's only one link, we remove the full header.
This is change is there to allow HTTP/1 clients to express HTTP/2 pushes
in a way that doesn't affect the response sent to the client.