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Do compress grpc-web responses #408

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25 changes: 25 additions & 0 deletions tower-http/src/compression/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,31 @@ mod tests {
assert_eq!(res.headers()[CONTENT_ENCODING], "gzip");
}

#[tokio::test]
async fn does_compress_grpc_web() {
async fn handle(_req: Request<Body>) -> Result<Response<Body>, Error> {
let mut res = Response::new(Body::from(
"a".repeat((SizeAbove::DEFAULT_MIN_SIZE * 2) as usize),
));
res.headers_mut()
.insert(CONTENT_TYPE, "application/grpc-web+proto".parse().unwrap());
Ok(res)
}

let svc = Compression::new(service_fn(handle));

let res = svc
.oneshot(
Request::builder()
.header(ACCEPT_ENCODING, "gzip")
.body(Body::empty())
.unwrap(),
)
.await
.unwrap();
assert_eq!(res.headers()[CONTENT_ENCODING], "gzip");
}

#[tokio::test]
async fn compress_with_quality() {
const DATA: &str = "Check compression quality level! Check compression quality level! Check compression quality level!";
Expand Down
10 changes: 7 additions & 3 deletions tower-http/src/compression/predicate.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,10 @@ pub struct NotForContentType {

impl NotForContentType {
/// Predicate that wont compress gRPC responses.
pub const GRPC: Self = Self::const_new("application/grpc");
pub const GRPC: Self = Self {
content_type: Str::Static("application/grpc"),
exception: Some(Str::Static("application/grpc-web")),
};

/// Predicate that wont compress images.
pub const IMAGES: Self = Self {
Expand Down Expand Up @@ -222,13 +225,14 @@ impl Predicate for NotForContentType {
where
B: Body,
{
let cty = content_type(response);
if let Some(except) = &self.exception {
if content_type(response) == except.as_str() {
if cty.starts_with(except.as_str()) {
return true;
}
}

!content_type(response).starts_with(self.content_type.as_str())
!cty.starts_with(self.content_type.as_str())
}
}

Expand Down