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feat(envoy): Allow to pass arbitrary http headers to upstream calls #4713

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feat(envoy): Allow to pass arbitrary http headers to upstream calls #4713

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11 changes: 11 additions & 0 deletions relay-config/src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -854,6 +854,11 @@ pub struct Http {
///
/// This option does not have any effect on processing mode.
pub global_metrics: bool,
/// Additional HTTP headers to send with every request to the upstream.
///
/// These headers are added to every request made to the upstream. They can be used to
/// configure custom authentication, routing, or other HTTP headers required by the upstream.
additional_headers: HashMap<String, String>,
}

impl Default for Http {
Expand All @@ -869,6 +874,7 @@ impl Default for Http {
project_failure_interval: default_project_failure_interval(),
encoding: HttpEncoding::Zstd,
global_metrics: false,
additional_headers: HashMap::new(),
}
}
}
Expand Down Expand Up @@ -1898,6 +1904,11 @@ impl Config {
self.values.http.host_header.as_deref()
}

/// Returns additional HTTP headers to send with every request to the upstream.
pub fn http_additional_headers(&self) -> &HashMap<String, String> {
&self.values.http.additional_headers
}

/// Returns the listen address.
pub fn listen_addr(&self) -> SocketAddr {
(self.values.relay.host, self.values.relay.port).into()
Expand Down
4 changes: 4 additions & 0 deletions relay-server/src/services/upstream.rs
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Expand Up @@ -771,9 +771,13 @@ impl SharedClient {
.config
.http_host_header()
.unwrap_or_else(|| self.config.upstream_descriptor().host());
let additional_headers = self.config.http_additional_headers();

let mut builder = RequestBuilder::reqwest(self.reqwest.request(request.method(), url));
builder.header("Host", host_header.as_bytes());
for (key, value) in additional_headers {
builder.header(key, value);
}

if request.set_relay_id() {
if let Some(credentials) = self.config.credentials() {
Expand Down
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