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script: Move navigation fetching to the ScriptThread (#34919)

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This allows reusing the asynchrnous fetch mechanism that we use for page
resources and is likely a step toward removing the `FetchThread`.

Benefits:
 - Reduces IPC traffic during navigation. Now instead of bouncing
   between the constellation and the `ScriptThread` responses are sent
   directly to the `ScriptThread`.
 - Allows cancelling loads after redirects, which was not possible
   before.

There is the question of what to do when a redirect is cross-origin
(#23037). This currently isn't handled properly as the `Constellation`
sends data to the same `Pipeline` that initiated the load. This change
doesn't fix this issue, but does make it more possible for the
`ScriptThread` to shut down the pipeline and ask the `Constellation` to
replace it with a new one.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-01-10 13:19:40 +01:00 • committed by GitHub
parent 73c0701c83
commit fbd77b4524
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16 changed files with 420 additions and 460 deletions
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17
components/net/http_loader.rs
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@ -56,6 +56,7 @@ use net_traits::response::{HttpsState, Response, ResponseBody, ResponseType};
use net_traits::{
CookieSource, FetchMetadata, NetworkError, RedirectEndValue, RedirectStartValue,
ReferrerPolicy, ResourceAttribute, ResourceFetchTiming, ResourceTimeValue,
DOCUMENT_ACCEPT_HEADER_VALUE,
};
use servo_arc::Arc;
use servo_url::{ImmutableOrigin, ServoUrl};
@ -77,10 +78,6 @@ use crate::hsts::HstsList;
use crate::http_cache::{CacheKey, HttpCache};
use crate::resource_thread::{AuthCache, AuthCacheEntry};
/// <https://fetch.spec.whatwg.org/#document-accept-header-value>
pub const DOCUMENT_ACCEPT_HEADER_VALUE: HeaderValue =
HeaderValue::from_static("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
/// The various states an entry of the HttpCache can be in.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum HttpCacheEntryState {
@ -146,18 +143,6 @@ fn set_default_accept_encoding(headers: &mut HeaderMap) {
);
}
pub fn set_default_accept_language(headers: &mut HeaderMap) {
if headers.contains_key(header::ACCEPT_LANGUAGE) {
return;
}
// TODO(eijebong): Change this once typed headers are done
headers.insert(
header::ACCEPT_LANGUAGE,
HeaderValue::from_static("en-US,en;q=0.5"),
);
}
/// <https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-state-no-referrer-when-downgrade>
fn no_referrer_when_downgrade(referrer_url: ServoUrl, current_url: ServoUrl) -> Option<ServoUrl> {
// Step 1