Below shows an example of preserving the header case for HTTP 1.x requests
+proxyHeaders:
+ perserveHttp1HeaderCase: true
+Some headers are enabled by default, and require explicitly disabling. See below for an example of disabling all default-enabled headers:
proxyHeaders:
forwardedClientCert: SANITIZE
@@ -4132,6 +4136,25 @@ ProxyConfig.ProxyHeaders
By default, the behavior is unspecified.
If IN_MESH, these headers will not be appended to outbound requests from sidecars to services not in-mesh.
+
+
+No
+
+
+
+preserveHttp1HeaderCaseBoolValue
+When true, the original case of HTTP/1.x headers will be preserved
+as they pass through the proxy, rather than normalizing them to lowercase.
+This field is particularly useful for applications that require case-sensitive
+headers for interoperability with downstream systems or APIs that expect specific
+casing.
+The preserve_http1_header_case option only applies to HTTP/1.x traffic, as HTTP/2 requires all headers
+to be lowercase per the protocol specification. Envoy will ignore this field for HTTP/2
+requests and automatically normalize headers to lowercase, ensuring compliance with HTTP/2
+standards.
+
No
diff --git a/mesh/v1alpha1/proxy.pb.go b/mesh/v1alpha1/proxy.pb.go
index 037a4b02a2..83a84d0c5f 100644
--- a/mesh/v1alpha1/proxy.pb.go
+++ b/mesh/v1alpha1/proxy.pb.go
@@ -1029,6 +1029,15 @@ type ProxyConfig struct {
//
// ```
//
+ // # Below shows an example of preserving the header case for HTTP 1.x requests
+ //
+ // ```yaml
+ // proxyHeaders:
+ //
+ // perserveHttp1HeaderCase: true
+ //
+ // ```
+ //
// Some headers are enabled by default, and require explicitly disabling. See below for an example of disabling all default-enabled headers:
//
// ```yaml
@@ -2279,6 +2288,16 @@ type ProxyConfig_ProxyHeaders struct {
// By default, the behavior is unspecified.
// If IN_MESH, these headers will not be appended to outbound requests from sidecars to services not in-mesh.
MetadataExchangeHeaders *ProxyConfig_ProxyHeaders_MetadataExchangeHeaders `protobuf:"bytes,6,opt,name=metadata_exchange_headers,json=metadataExchangeHeaders,proto3" json:"metadata_exchange_headers,omitempty"`
+ // When true, the original case of HTTP/1.x headers will be preserved
+ // as they pass through the proxy, rather than normalizing them to lowercase.
+ // This field is particularly useful for applications that require case-sensitive
+ // headers for interoperability with downstream systems or APIs that expect specific
+ // casing.
+ // The preserve_http1_header_case option only applies to HTTP/1.x traffic, as HTTP/2 requires all headers
+ // to be lowercase per the protocol specification. Envoy will ignore this field for HTTP/2
+ // requests and automatically normalize headers to lowercase, ensuring compliance with HTTP/2
+ // standards.
+ PreserveHttp1HeaderCase *wrappers.BoolValue `protobuf:"bytes,40,opt,name=preserve_http1_header_case,json=preserveHttp1HeaderCase,proto3" json:"preserve_http1_header_case,omitempty"`
}
func (x *ProxyConfig_ProxyHeaders) Reset() {
@@ -2360,6 +2379,13 @@ func (x *ProxyConfig_ProxyHeaders) GetMetadataExchangeHeaders() *ProxyConfig_Pro
return nil
}
+func (x *ProxyConfig_ProxyHeaders) GetPreserveHttp1HeaderCase() *wrappers.BoolValue {
+ if x != nil {
+ return x.PreserveHttp1HeaderCase
+ }
+ return nil
+}
+
type ProxyConfig_ProxyHeaders_Server struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@@ -2869,7 +2895,7 @@ var file_mesh_v1alpha1_proxy_proto_rawDesc = []byte{
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@@ -3038,7 +3064,7 @@ var file_mesh_v1alpha1_proxy_proto_rawDesc = []byte{
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@@ -3086,99 +3112,104 @@ var file_mesh_v1alpha1_proxy_proto_rawDesc = []byte{
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var (
@@ -3294,21 +3325,22 @@ var file_mesh_v1alpha1_proxy_proto_depIdxs = []int32{
31, // 50: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.attempt_count:type_name -> istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.AttemptCount
32, // 51: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.envoy_debug_headers:type_name -> istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.EnvoyDebugHeaders
33, // 52: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.metadata_exchange_headers:type_name -> istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.MetadataExchangeHeaders
- 36, // 53: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.Server.disabled:type_name -> google.protobuf.BoolValue
- 36, // 54: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.RequestId.disabled:type_name -> google.protobuf.BoolValue
- 36, // 55: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.AttemptCount.disabled:type_name -> google.protobuf.BoolValue
- 36, // 56: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.EnvoyDebugHeaders.disabled:type_name -> google.protobuf.BoolValue
- 5, // 57: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.MetadataExchangeHeaders.mode:type_name -> istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.MetadataExchangeMode
- 36, // 58: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.subject:type_name -> google.protobuf.BoolValue
- 36, // 59: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.cert:type_name -> google.protobuf.BoolValue
- 36, // 60: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.chain:type_name -> google.protobuf.BoolValue
- 36, // 61: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.dns:type_name -> google.protobuf.BoolValue
- 36, // 62: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.uri:type_name -> google.protobuf.BoolValue
- 63, // [63:63] is the sub-list for method output_type
- 63, // [63:63] is the sub-list for method input_type
- 63, // [63:63] is the sub-list for extension type_name
- 63, // [63:63] is the sub-list for extension extendee
- 0, // [0:63] is the sub-list for field type_name
+ 36, // 53: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.preserve_http1_header_case:type_name -> google.protobuf.BoolValue
+ 36, // 54: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.Server.disabled:type_name -> google.protobuf.BoolValue
+ 36, // 55: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.RequestId.disabled:type_name -> google.protobuf.BoolValue
+ 36, // 56: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.AttemptCount.disabled:type_name -> google.protobuf.BoolValue
+ 36, // 57: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.EnvoyDebugHeaders.disabled:type_name -> google.protobuf.BoolValue
+ 5, // 58: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.MetadataExchangeHeaders.mode:type_name -> istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.MetadataExchangeMode
+ 36, // 59: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.subject:type_name -> google.protobuf.BoolValue
+ 36, // 60: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.cert:type_name -> google.protobuf.BoolValue
+ 36, // 61: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.chain:type_name -> google.protobuf.BoolValue
+ 36, // 62: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.dns:type_name -> google.protobuf.BoolValue
+ 36, // 63: istio.mesh.v1alpha1.ProxyConfig.ProxyHeaders.SetCurrentClientCertDetails.uri:type_name -> google.protobuf.BoolValue
+ 64, // [64:64] is the sub-list for method output_type
+ 64, // [64:64] is the sub-list for method input_type
+ 64, // [64:64] is the sub-list for extension type_name
+ 64, // [64:64] is the sub-list for extension extendee
+ 0, // [0:64] is the sub-list for field type_name
}
func init() { file_mesh_v1alpha1_proxy_proto_init() }
diff --git a/mesh/v1alpha1/proxy.proto b/mesh/v1alpha1/proxy.proto
index 82f542488f..cd2cd6e4b5 100644
--- a/mesh/v1alpha1/proxy.proto
+++ b/mesh/v1alpha1/proxy.proto
@@ -625,6 +625,13 @@ message ProxyConfig {
// disabled: true
// ```
//
+ // Below shows an example of preserving the header case for HTTP 1.x requests
+ //
+ // ```yaml
+ // proxyHeaders:
+ // perserveHttp1HeaderCase: true
+ // ```
+ //
// Some headers are enabled by default, and require explicitly disabling. See below for an example of disabling all default-enabled headers:
//
// ```yaml
@@ -725,6 +732,17 @@ message ProxyConfig {
// By default, the behavior is unspecified.
// If IN_MESH, these headers will not be appended to outbound requests from sidecars to services not in-mesh.
MetadataExchangeHeaders metadata_exchange_headers = 6;
+ // When true, the original case of HTTP/1.x headers will be preserved
+ // as they pass through the proxy, rather than normalizing them to lowercase.
+ // This field is particularly useful for applications that require case-sensitive
+ // headers for interoperability with downstream systems or APIs that expect specific
+ // casing.
+ // The preserve_http1_header_case option only applies to HTTP/1.x traffic, as HTTP/2 requires all headers
+ // to be lowercase per the protocol specification. Envoy will ignore this field for HTTP/2
+ // requests and automatically normalize headers to lowercase, ensuring compliance with HTTP/2
+ // standards.
+ google.protobuf.BoolValue preserve_http1_header_case = 40;
+
}
}
diff --git a/networking/v1beta1/proxy_config.proto b/networking/v1beta1/proxy_config.proto
index 6b6e5a8a0c..6fa52911ac 100644
--- a/networking/v1beta1/proxy_config.proto
+++ b/networking/v1beta1/proxy_config.proto
@@ -139,4 +139,4 @@ message ProxyImage {
// Other values are allowed if those image types (example: centos) are published to the specified hub.
// supported values: default, debug, distroless.
string image_type = 1;
-}
+}
\ No newline at end of file
diff --git a/releasenotes/notes/preserve-header-case.yaml b/releasenotes/notes/preserve-header-case.yaml
new file mode 100644
index 0000000000..38c39d4b02
--- /dev/null
+++ b/releasenotes/notes/preserve-header-case.yaml
@@ -0,0 +1,8 @@
+apiVersion: release-notes/v2
+kind: feature
+area: traffic-management
+issue:
+ - https://github.com/istio/istio/issues/53680
+releaseNotes:
+ - |
+ **Added** a ProxyConfig field to preserve the original case of HTTP/1.x headers.
\ No newline at end of file