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Migrate user agent string to Cow<'static, str>.

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In most scenarios, where the user of Servo will not override the default
user agent, the user agent can be a `&'static str`. But since we allow
for customization, we currently use a `String` to represent the user
agent. This commit migrates the user agent to be represented as a
`Cow<'static, str>`, which (at the cost of ergonomics) prevents
unnecessary allocations whenever cloning the user agent string in the
scenario the user doesn't override the user agent.
This commit is contained in:
Corey Farwell 2016-10-10 15:30:46 -04:00
parent ef7423bf00
commit 60afad1b61
7 changed files with 66 additions and 63 deletions
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6
components/net/fetch/methods.rs
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@ -29,6 +29,7 @@ use net_traits::request::{Type, Origin, Window};
use net_traits::response::{HttpsState, TerminationReason};
use net_traits::response::{Response, ResponseBody, ResponseType};
use resource_thread::CancellationListener;
use std::borrow::Cow;
use std::collections::HashSet;
use std::fs::File;
use std::io::Read;
@ -51,7 +52,7 @@ enum Data {
pub struct FetchContext {
pub state: HttpState,
pub user_agent: String,
pub user_agent: Cow<'static, str>,
pub devtools_chan: Option<Sender<DevtoolsControlMsg>>,
}
@ -763,7 +764,8 @@ fn http_network_or_cache_fetch(request: Rc<Request>,
// Step 8
if !http_request.headers.borrow().has::<UserAgent>() {
http_request.headers.borrow_mut().set(UserAgent(context.user_agent.clone()));
let user_agent = context.user_agent.clone().into_owned();
http_request.headers.borrow_mut().set(UserAgent(user_agent));
}
match http_request.cache_mode.get() {