diff --git a/sxg_rs/Cargo.toml b/sxg_rs/Cargo.toml
index 28721c8f..13db1cb7 100644
--- a/sxg_rs/Cargo.toml
+++ b/sxg_rs/Cargo.toml
@@ -21,9 +21,11 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
+default = ["strip_id_headers"]
 js_fetcher = []
 js_signer = []
 rust_signer = []
+strip_id_headers = []
 
 [dependencies]
 async-trait = "0.1.50"
diff --git a/sxg_rs/src/headers.rs b/sxg_rs/src/headers.rs
index 9813d282..f3dad47d 100644
--- a/sxg_rs/src/headers.rs
+++ b/sxg_rs/src/headers.rs
@@ -12,6 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use crate::http_parser::{
+    parse_accept_header,
+    parse_cache_control_header,
+    parse_content_type_header,
+    media_type::MediaType,
+};
 use std::collections::{BTreeSet, HashMap, HashSet};
 use once_cell::sync::Lazy;
 use crate::http::HeaderFields;
@@ -88,7 +94,7 @@ impl Headers {
     }
     pub fn validate_as_sxg_payload(&self) -> Result<(), String> {
         for (k, v) in self.0.iter() {
-            if STATEFUL_HEADERS.contains(k.as_str()) {
+            if DONT_SIGN_RESPONSE_HEADERS.contains(k.as_str()) {
                 return Err(format!(r#"A stateful header "{}" is found."#, k));
             }
             if CACHE_CONTROL_HEADERS.contains(k.as_str()) {
@@ -122,8 +128,15 @@ impl Headers {
         use crate::cbor::DataItem;
         let connection = self.connection_headers();
         let mut fields: Vec<(&str, &str)> = vec![];
+        let html = self.0.get("content-type").map_or(false, |t|
+            matches!(parse_content_type_header(t),
+                     Ok(MediaType {primary_type, sub_type, ..})
+                         if primary_type.eq_ignore_ascii_case("text") && sub_type.eq_ignore_ascii_case("html")));
         for (k, v) in self.0.iter() {
-            if UNCACHED_HEADERS.contains(k.as_str()) || STATEFUL_HEADERS.contains(k.as_str()) || connection.contains(k) {
+            if STRIP_RESPONSE_HEADERS.contains(k.as_str()) || DONT_SIGN_RESPONSE_HEADERS.contains(k.as_str()) || connection.contains(k) {
+                continue;
+            }
+            if !html && (STRIP_SUBRESOURCE_RESPONSE_HEADERS.contains(k.as_str()) || crate::id_headers::ID_HEADERS.contains(k.as_str())) {
                 continue;
             }
             fields.push((k, v));
@@ -156,7 +169,7 @@ impl Headers {
     pub fn signature_duration(&self) -> Result<Duration, String> {
         // Default to 7 days unless a cache-control directive lowers it.
         if let Some(value) = self.0.get("cache-control") {
-            if let Ok(duration) = crate::http_parser::parse_cache_control_header(value) {
+            if let Ok(duration) = parse_cache_control_header(value) {
                 // https://github.com/google/webpackager/blob/main/docs/cache_requirements.md
                 const MIN_DURATION: Duration = Duration::from_secs(120);
                 return if duration >= MIN_DURATION {
@@ -171,7 +184,8 @@ impl Headers {
     }
 }
 
-static UNCACHED_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
+// These headers are always stripped before signing.
+static STRIP_RESPONSE_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
     vec![
         // https://wicg.github.io/webpackage/draft-yasskin-httpbis-origin-signed-exchanges-impl.html#name-uncached-header-fields
         "connection",
@@ -190,10 +204,37 @@ static UNCACHED_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
         // https://github.com/google/webpackager/blob/master/docs/cache_requirements.md
         "variant-key-04",
         "variants-04",
+
+    ].into_iter().collect()
+});
+
+// These headers don't affect the semantics of the response inside an
+// SXG, but they vary frequently. This prevents the SXG from being used
+// as a subresource due to the header-integrity requirement:
+// https://github.com/WICG/webpackage/blob/main/explainers/signed-exchange-subresource-substitution.md.
+static STRIP_SUBRESOURCE_RESPONSE_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
+    vec![
+        // These headers are standard, but signed headers don't affect the
+        // browser caching behavior, because the SXG is only stored in the
+        // referring document's prefetch cache, per
+        // https://wicg.github.io/webpackage/loading.html#document-prefetched-signed-exchanges-for-navigation.
+        // The Date header could theoretically have an impact on SXG loading,
+        // according to
+        // https://wicg.github.io/webpackage/loading.html#mp-http-network-or-cache-fetch,
+        // but I don't see evidence of that in
+        // https://source.chromium.org/chromium/chromium/src/+/main:content/browser/web_package/.
+        "age",
+        "date",
+        "expires",
+        "last-modified",
+        "server-timing",
+        "via",
+        "warning",
     ].into_iter().collect()
 });
 
-static STATEFUL_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
+// These headers prevent signing, unless stripped by the strip_response_headers param.
+static DONT_SIGN_RESPONSE_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
     vec![
         // https://wicg.github.io/webpackage/draft-yasskin-http-origin-signed-responses.html#stateful-headers
         "authentication-control",
@@ -229,7 +270,7 @@ static CACHE_CONTROL_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
 // and either accept_filter != PrefersSxg or its `q` value is 1.
 fn validate_accept_header(accept: &str, accept_filter: AcceptFilter) -> Result<(), String> {
     let accept = accept.trim();
-    let accept = crate::http_parser::parse_accept_header(accept)?;
+    let accept = parse_accept_header(accept)?;
     if accept.len() == 0 {
         return Err(format!("Accept header is empty"));
     }
@@ -383,4 +424,13 @@ mod tests {
         assert_eq!(headers(vec![("cache-control", "doesn't even parse")]).signature_duration().unwrap(), SEVEN_DAYS);
         assert_eq!(headers(vec![("cache-control", "max=, max-age=3600")]).signature_duration().unwrap(), SEVEN_DAYS);
     }
+
+    // === get_signed_headers_bytes ===
+    #[test]
+    fn strip_id_headers() {
+        assert_eq!(headers(vec![("content-type", "image/jpeg"), ("x-request-id", "abcdef123")]).get_signed_headers_bytes(200, &[]),
+                   b"\xA4FdigestMmi-sha256-03=G:statusC200Lcontent-typeJimage/jpegPcontent-encodingLmi-sha256-03");
+        assert_eq!(headers(vec![("content-type", "text/html;charset=utf-8"), ("x-request-id", "abcdef123")]).get_signed_headers_bytes(200, &[]),
+                   b"\xA5FdigestMmi-sha256-03=G:statusC200Lcontent-typeWtext/html;charset=utf-8Lx-request-idIabcdef123Pcontent-encodingLmi-sha256-03");
+    }
 }
diff --git a/sxg_rs/src/http_parser/mod.rs b/sxg_rs/src/http_parser/mod.rs
index fc20e98d..e4eb2a6e 100644
--- a/sxg_rs/src/http_parser/mod.rs
+++ b/sxg_rs/src/http_parser/mod.rs
@@ -15,11 +15,12 @@
 mod accept;
 mod base;
 mod cache_control;
-mod media_type;
+pub mod media_type;
 
 use nom::{
     IResult,
     character::complete::char as char1,
+    combinator::complete,
     eof,
     separated_list0,
     separated_pair,
@@ -49,6 +50,12 @@ pub fn parse_accept_header(input: &str) -> Result<Vec<accept::Accept>, String> {
     parse_vec(input, accept::accept)
 }
 
+pub fn parse_content_type_header(input: &str) -> Result<media_type::MediaType, String> {
+    complete(media_type::media_type)(input)
+        .map(|(_, output)| output)
+        .map_err(format_nom_err)
+}
+
 // Returns the freshness lifetime for a shared cache.
 pub fn parse_cache_control_header(input: &str) -> Result<Duration, String> {
     let directives = parse_vec(input, cache_control::directive)?;
diff --git a/sxg_rs/src/id_headers.rs b/sxg_rs/src/id_headers.rs
new file mode 100644
index 00000000..3b78a9f9
--- /dev/null
+++ b/sxg_rs/src/id_headers.rs
@@ -0,0 +1,1163 @@
+use std::collections::HashSet;
+use once_cell::sync::Lazy;
+
+// The full list of id headers is adds about 37K to the binary, as of writing,
+// so users may choose to exclude it.
+#[cfg(not(feature="strip_id_headers"))]
+pub static ID_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| HashSet::new());
+
+#[cfg(feature="strip_id_headers")]
+pub static ID_HEADERS: Lazy<HashSet<&'static str>> = Lazy::new(|| {
+    vec![
+        // These headers are nonstandard, and don't affect browser behavior at
+        // all, but appear to be a source of entropy. If included in an SXG,
+        // they prevent that SXG from being useful as a signed subresource. See
+        // the comment on STRIP_SUBRESOURCE_RESPONSE_HEADERS for details.
+        //
+        // These are things like request IDs, backend server IDs, and cache hit
+        // status. A useful resource for surveying HTTP response headers is
+        // https://webtechsurvey.com/common-response-headers.
+        r#"ag-correlation-id"#,
+        r#"age"#,
+        r#"akamai-cache-status"#,
+        r#"akamai-grn-leg2"#,
+        r#"akamai-grn"#,
+        r#"ali-swift-global-savetime"#,
+        r#"apigw-requestid"#,
+        r#"apple-timing-app"#,
+        r#"ar-atime"#,
+        r#"ar-request-id"#,
+        r#"ar-sid"#,
+        r#"art-pagecache-status"#,
+        r#"auid"#,
+        r#"authorization"#,
+        r#"autype"#,
+        r#"b3"#,
+        r#"backend-name"#,
+        r#"backend"#,
+        r#"be"#,
+        r#"belfrage-cache-status"#,
+        r#"bid"#,
+        r#"bln-server"#,
+        r#"brequestid"#,
+        r#"cache-flow"#,
+        r#"cache-instance-id"#,
+        r#"cache-miss-to-origin"#,
+        r#"cache-provider"#,
+        r#"cache-provider"#,
+        r#"cache-status"#,
+        r#"cache-tag"#,
+        r#"cache-tags"#,
+        r#"cache"#,
+        r#"categoryid"#,
+        r#"cd"#,
+        r#"cdn-host"#,
+        r#"cdn-ip"#,
+        r#"cdn-request-time"#,
+        r#"cdn-source"#,
+        r#"cdn-user-ip"#,
+        r#"cdncip"#,
+        r#"ce-cache"#,
+        r#"ce-version"#,
+        r#"cf-apo-via"#,
+        r#"cf-cache-status"#,
+        r#"cf-child-ray"#,
+        r#"cf-railgun"#,
+        r#"cf-ray"#,
+        r#"cf-request-id"#,
+        r#"ch-request-id"#,
+        r#"chimera-api-server"#,
+        r#"cl-cache"#,
+        r#"cleantemp"#,
+        r#"client-authentic-ip"#,
+        r#"client-id"#,
+        r#"clientip"#,
+        r#"cluster-host"#,
+        r#"cluster"#,
+        r#"cm-edge-cache"#,
+        r#"cm-route"#,
+        r#"cm-tx-id"#,
+        r#"cmsfirstpublishtimestamp"#,
+        r#"cmsid"#,
+        r#"cmsts"#,
+        r#"composite"#,
+        r#"compression-time"#,
+        r#"contao-cache"#,
+        r#"correlation-id"#,
+        r#"correlationid"#,
+        r#"cp"#,
+        r#"cpc-cache"#,
+        r#"cs-server"#,
+        r#"cx-notice"#,
+        r#"date"#,
+        r#"db-time"#,
+        r#"dc"#,
+        r#"debug"#,
+        r#"deploy-instance"#,
+        r#"discourse-proxy-id"#,
+        r#"dn-cache-status"#,
+        r#"dn-request-id"#,
+        r#"drupal-pagecache-memcache"#,
+        r#"du"#,
+        r#"dynatrace"#,
+        r#"eagleeye-traceid"#,
+        r#"eagleid"#,
+        r#"edge-copy-time"#,
+        r#"edgeroutingkey"#,
+        r#"eomportal-instance"#,
+        r#"excuteaetime"#,
+        r#"excuteretime"#,
+        r#"exec-time"#,
+        r#"execution-time"#,
+        r#"fai-cache-status"#,
+        r#"fai-w-agent-aid"#,
+        r#"fai-w-flow"#,
+        r#"fastcgi-cache"#,
+        r#"fc"#,
+        r#"fnac-datacenter"#,
+        r#"fnac-modulerouting"#,
+        r#"fpc-cache-id"#,
+        r#"fpc-cache-id"#,
+        r#"fss-cache"#,
+        r#"fss-proxy"#,
+        r#"function-execution-id"#,
+        r#"galileo-status-cache"#,
+        r#"ghost-age"#,
+        r#"ghost-cache"#,
+        r#"global-cdn-age"#,
+        r#"group"#,
+        r#"grp"#,
+        r#"handle-fetch-duration"#,
+        r#"header"#,
+        r#"healthy"#,
+        r#"hn"#,
+        r#"host-header"#,
+        r#"hostname"#,
+        r#"hs-cf-worker-build-number"#,
+        r#"hs-cf-worker-version"#,
+        r#"hummingbird-cache"#,
+        r#"id"#,
+        r#"idc"#,
+        r#"ids"#,
+        r#"igor-pid"#,
+        r#"iid"#,
+        r#"imghost"#,
+        r#"inserted-into-cache-at"#,
+        r#"ip"#,
+        r#"is-akamai-cdn"#,
+        r#"isvarnish"#,
+        r#"joe-x"#,
+        r#"ki-edge"#,
+        r#"kp-cache-status"#,
+        r#"l5d-success-class"#,
+        r#"latitude"#,
+        r#"lb"#,
+        r#"lmserver"#,
+        r#"log-origin"#,
+        r#"log-origin"#,
+        r#"longitude"#,
+        r#"m-cache-status"#,
+        r#"map"#,
+        r#"medium-fulfilled-by"#,
+        r#"medium-missing-time"#,
+        r#"memento-datetime"#,
+        r#"message-id"#,
+        r#"meta-geo-continent"#,
+        r#"meta-geo"#,
+        r#"microsoftsharepointteamservices"#,
+        r#"moz-cache-status"#,
+        r#"mrf-cache-status"#,
+        r#"mrf-swcacheversion"#,
+        r#"mrf-tech"#,
+        r#"ms-cv"#,
+        r#"n-cache-date"#,
+        r#"n-cache"#,
+        r#"name"#,
+        r#"nc"#,
+        r#"ncbi-phid"#,
+        r#"ncbi-sid"#,
+        r#"nd"#,
+        r#"nginx-cache"#,
+        r#"nginx-cqvip"#,
+        r#"nginx-version"#,
+        r#"nikkei-app-version"#,
+        r#"no"#,
+        r#"node"#,
+        r#"nodecache"#,
+        r#"notes"#,
+        r#"number"#,
+        r#"o-host"#,
+        r#"object-status"#,
+        r#"onion-location"#,
+        r#"origin-server"#,
+        r#"ostk-callchainid"#,
+        r#"pageid"#,
+        r#"pagesurlcustomfieldinfo"#,
+        r#"pantheon-trace-id"#,
+        r#"param"#,
+        r#"patch-surrogate-key"#,
+        r#"path"#,
+        r#"pbs"#,
+        r#"pd"#,
+        r#"pinterest-generated-by"#,
+        r#"pinterest-version"#,
+        r#"pl-location"#,
+        r#"popmenu-version"#,
+        r#"pressidium-rid"#,
+        r#"processtime"#,
+        r#"protected"#,
+        r#"publish-time-in-millis"#,
+        r#"quizlet-auth-uid"#,
+        r#"rating"#,
+        r#"redirectstableidentifier"#,
+        r#"render-time"#,
+        r#"req-svc-chain"#,
+        r#"request-context"#,
+        r#"request-id"#,
+        r#"resin-trace"#,
+        r#"resourcetag"#,
+        r#"response-time"#,
+        r#"rlogid"#,
+        r#"rt-fastcgi-cache"#,
+        r#"rt-proxy-cache"#,
+        r#"rtss"#,
+        r#"s-1k-s"#,
+        r#"sbgi-rendertime"#,
+        r#"sd"#,
+        r#"selected-fe"#,
+        r#"selected-route"#,
+        r#"selected"#,
+        r#"seo-cost-millis"#,
+        r#"seo-from-app"#,
+        r#"seo-now-time"#,
+        r#"seq"#,
+        r#"ser"#,
+        r#"served-by"#,
+        r#"served"#,
+        r#"servedby"#,
+        r#"server-host"#,
+        r#"server-hostname"#,
+        r#"server-info"#,
+        r#"server-node"#,
+        r#"serverid"#,
+        r#"servername"#,
+        r#"service-request-id"#,
+        r#"sesese"#,
+        r#"sg-optimizer-worker-status"#,
+        r#"shankrouter"#,
+        r#"shanktracerid"#,
+        r#"sii"#,
+        r#"sn-cache-status"#,
+        r#"sn-cache"#,
+        r#"source"#,
+        r#"spiislatency"#,
+        r#"spotify-request-id"#,
+        r#"sprequestduration"#,
+        r#"sprequestguid"#,
+        r#"state"#,
+        r#"sv"#,
+        r#"tag"#,
+        r#"tail"#,
+        r#"tcdn-l2-backend"#,
+        r#"tcdn-l2-client-ip"#,
+        r#"tcdn-l2-hits"#,
+        r#"tcdn-l2-host"#,
+        r#"tid"#,
+        r#"time"#,
+        r#"tmp-set-cookie"#,
+        r#"tp-cache"#,
+        r#"tp-l2-cache"#,
+        r#"trace-id"#,
+        r#"tracecode"#,
+        r#"traceid"#,
+        r#"traceparent"#,
+        r#"tracking-code"#,
+        r#"true-client-ip"#,
+        r#"ts"#,
+        r#"tsreq"#,
+        r#"ttl"#,
+        r#"twc-ak-req-id"#,
+        r#"twc-connection-speed"#,
+        r#"twc-geoip-city"#,
+        r#"twc-geoip-country"#,
+        r#"twc-geoip-dma"#,
+        r#"twc-geoip-latlong"#,
+        r#"twc-geoip-region"#,
+        r#"twc-locale-group"#,
+        r#"twc-path-locale"#,
+        r#"twc-privacy"#,
+        r#"uber-trace-id"#,
+        r#"utab"#,
+        r#"uuid"#,
+        r#"varnish-age"#,
+        r#"varnish-cache"#,
+        r#"vartuoso-cache"#,
+        r#"versao"#,
+        r#"visitor-id"#,
+        r#"vx-cache"#,
+        r#"w"#,
+        r#"washserver"#,
+        r#"wcdn-cacheid"#,
+        r#"wcdn-connection-duration"#,
+        r#"wcdn-delivery-duration"#,
+        r#"wcdn-edge-id"#,
+        r#"wcdn-edge"#,
+        r#"wcdn-hosting-waiting-duration"#,
+        r#"wcdn-nfc-reason"#,
+        r#"wcdn-rayid"#,
+        r#"wcdn-status"#,
+        r#"wcdn-total-duration"#,
+        r#"webcakes-region"#,
+        r#"webserver"#,
+        r#"who-ip"#,
+        r#"wp-bullet-fastcgi-cache"#,
+        r#"wp-from-cache-domain"#,
+        r#"wpo-cache-status"#,
+        r#"wwgmui"#,
+        r#"wxu-next-hostname"#,
+        r#"wzws-ray"#,
+        r#"x-20m-cache"#,
+        r#"x-20m-webserver"#,
+        r#"x-ab-cache"#,
+        r#"x-ac"#,
+        r#"x-action-cache"#,
+        r#"x-activity-id"#,
+        r#"x-adblock-key"#,
+        r#"x-adv-varnish"#,
+        r#"x-age"#,
+        r#"x-ak-client-rtt"#,
+        r#"x-ak-country"#,
+        r#"x-ak-countrydetails"#,
+        r#"x-ak-request-id"#,
+        r#"x-akam-sw-version"#,
+        r#"x-akamai-fwd-auth-data"#,
+        r#"x-akamai-fwd-auth-sha"#,
+        r#"x-akamai-fwd-auth-sign"#,
+        r#"x-akamai-http2"#,
+        r#"x-akamai-lattitude"#,
+        r#"x-akamai-longitude"#,
+        r#"x-akamai-transformed"#,
+        r#"x-alcache"#,
+        r#"x-amz-apigw-id"#,
+        r#"x-amz-cf-id"#,
+        r#"x-amz-cf-pop"#,
+        r#"x-amz-id-2"#,
+        r#"x-amz-meta-mtime"#,
+        r#"x-amz-meta-publish-time-in-millis"#,
+        r#"x-amz-meta-shard"#,
+        r#"x-amz-replication-status"#,
+        r#"x-amz-request-id"#,
+        r#"x-amz-rid"#,
+        r#"x-amz-storage-class"#,
+        r#"x-amz-version-id"#,
+        r#"x-amzn-remapped-connection"#,
+        r#"x-amzn-remapped-date"#,
+        r#"x-amzn-requestid"#,
+        r#"x-amzn-trace-id"#,
+        r#"x-apm-inst-hash"#,
+        r#"x-apm-svc-key"#,
+        r#"x-app-info"#,
+        r#"x-app-server"#,
+        r#"x-app-version"#,
+        r#"x-app"#,
+        r#"x-apple-application-instance"#,
+        r#"x-apple-application-site"#,
+        r#"x-apple-jingle-correlation-key"#,
+        r#"x-apple-partner"#,
+        r#"x-apple-request-uuid"#,
+        r#"x-application-context"#,
+        r#"x-appserver"#,
+        r#"x-appversion"#,
+        r#"x-archive-orig-cf-ray"#,
+        r#"x-archive-orig-cf-request-id"#,
+        r#"x-archive-orig-connection"#,
+        r#"x-archive-orig-date"#,
+        r#"x-archive-orig-expires"#,
+        r#"x-archive-orig-last-modified"#,
+        r#"x-archive-src"#,
+        r#"x-asen"#,
+        r#"x-atg-version"#,
+        r#"x-az"#,
+        r#"x-azure-ref"#,
+        r#"x-b-cache"#,
+        r#"x-b-cookie"#,
+        r#"x-b3-parentspanid"#,
+        r#"x-b3-sampled"#,
+        r#"x-b3-spanid"#,
+        r#"x-b3-traceid-primal"#,
+        r#"x-b3-traceid"#,
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+        r#"x-dws-c"#,
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+        r#"x-ebay-pop-id"#,
+        r#"x-ebay-pop-id"#,
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+        r#"x-edge-ip"#,
+        r#"x-edge-location-klb"#,
+        r#"x-edge-location"#,
+        r#"x-edge-server"#,
+        r#"x-edge-timing"#,
+        r#"x-edge"#,
+        r#"x-edgeconnect-cache-status"#,
+        r#"x-edgeconnect-midmile-rtt"#,
+        r#"x-edgeconnect-origin-mex-latency"#,
+        r#"x-elapsed-time"#,
+        r#"x-ems-server"#,
+        r#"x-end-user-ip"#,
+        r#"x-end-user-visit-id"#,
+        r#"x-end-user-visitor-id"#,
+        r#"x-endurance-cache-level"#,
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+        r#"x-ezoic-cdn"#,
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+        r#"x-f5-node"#,
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+        r#"x-fastly-info"#,
+        r#"x-fb-debug"#,
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+        r#"x-generator-ip"#,
+        r#"x-generator-reqid"#,
+        r#"x-generator-time"#,
+        r#"x-geo-location"#,
+        r#"x-geoip"#,
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+        r#"x-gg-cache-status"#,
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+        r#"x-goog-generation"#,
+        r#"x-goog-hash"#,
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+        r#"x-gt-cache-status"#,
+        r#"x-gt-from"#,
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+        r#"x-hashtwo"#,
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+        r#"x-hcom-info"#,
+        r#"x-hcom-kes-info"#,
+        r#"x-hcom-origin-id"#,
+        r#"x-hcom-styx-info"#,
+        r#"x-heroku-version"#,
+        r#"x-highwire-filestream-for"#,
+        r#"x-highwire-sitecode"#,
+        r#"x-highwire-smart-code"#,
+        r#"x-hit"#,
+        r#"x-hits"#,
+        r#"x-hostname-vm"#,
+        r#"x-hs"#,
+        r#"x-http-via"#,
+        r#"x-i-sp"#,
+        r#"x-id"#,
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+        r#"x-ig-push-state"#,
+        r#"x-ihs-time"#,
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+        r#"x-im-api-version"#,
+        r#"x-in-apigateway"#,
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+        r#"x-iplb-request-id"#,
+        r#"x-iprice-cache"#,
+        r#"x-ips-cached-response"#,
+        r#"x-irc-cached"#,
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+        r#"x-ix-cache-status"#,
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+        r#"x-kinja-revision"#,
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+        r#"x-li-pop"#,
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+        r#"x-lima-id"#,
+        r#"x-linio-id"#,
+        r#"x-listing-id"#,
+        r#"x-litespeed-cache"#,
+        r#"x-llid"#,
+        r#"x-loc-id"#,
+        r#"x-locale"#,
+        r#"x-location-countrycode"#,
+        r#"x-location-id"#,
+        r#"x-location-state"#,
+        r#"x-location-statelong"#,
+        r#"x-location"#,
+        r#"x-log-country"#,
+        r#"x-logjam-request-id"#,
+        r#"x-loopia-node"#,
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+        r#"x-magento-debug"#,
+        r#"x-managed-by"#,
+        r#"x-market-req-id"#,
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+        r#"x-mcache"#,
+        r#"x-mcf-id"#,
+        r#"x-media"#,
+        r#"x-meli-trace-site"#,
+        r#"x-midtier"#,
+        r#"x-miniprofiler-ids"#,
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+        r#"x-mns-cache"#,
+        r#"x-mns-front"#,
+        r#"x-mol-georesp"#,
+        r#"x-mono"#,
+        r#"x-mp-caching-rules"#,
+        r#"x-mp-node"#,
+        r#"x-mp-pxnode"#,
+        r#"x-mrf-age"#,
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+        r#"x-mrs-age"#,
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+        r#"x-mrs-cache"#,
+        r#"x-ms-invokeapp"#,
+        r#"x-msedge-ref"#,
+        r#"x-mshield-cache-status"#,
+        r#"x-msig"#,
+        r#"x-mti"#,
+        r#"x-n-operationid"#,
+        r#"x-nbi-powered-by"#,
+        r#"x-neowing-server"#,
+        r#"x-newrelic-app-data"#,
+        r#"x-nf-request-id"#,
+        r#"x-nga-server"#,
+        r#"x-nginx-cache-status"#,
+        r#"x-nginx-cache"#,
+        r#"x-nginx-country"#,
+        r#"x-nginx-host"#,
+        r#"x-nginx-hostname"#,
+        r#"x-nginx-ip"#,
+        r#"x-nginx-pool"#,
+        r#"x-nginx-upstream-cache-status"#,
+        r#"x-nginx"#,
+        r#"x-niconico-sid"#,
+        r#"x-nids-serverid"#,
+        r#"x-nitro-cache"#,
+        r#"x-nlb"#,
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+        r#"x-node-id"#,
+        r#"x-node-name"#,
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+        r#"x-origin-region"#,
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+        r#"x-renderdate"#,
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+        r#"x-rn-rsrv"#,
+        r#"x-robots-tag"#,
+        r#"x-route"#,
+        r#"x-routing-service"#,
+        r#"x-rpw-version"#,
+        r#"x-rq"#,
+        r#"x-rs-ben-time"#,
+        r#"x-rs-ben"#,
+        r#"x-rs-ops"#,
+        r#"x-rs-time"#,
+        r#"x-runtime"#,
+        r#"x-s-cookie"#,
+        r#"x-s"#,
+        r#"x-safe-firewall"#,
+        r#"x-save-date"#,
+        r#"x-sb"#,
+        r#"x-sbistracker"#,
+        r#"x-sc"#,
+        r#"x-scale"#,
+        r#"x-scl-version"#,
+        r#"x-scm-server-number"#,
+        r#"x-scoop-last-modified"#,
+        r#"x-scope-id"#,
+        r#"x-scouter-gxid"#,
+        r#"x-sdfe-corr-id"#,
+        r#"x-secng-response"#,
+        r#"x-sedo-campaign-id"#,
+        r#"x-sedo-request-id"#,
+        r#"x-seen-by"#,
+        r#"x-ser"#,
+        r#"x-served-by-cc"#,
+        r#"x-served-by-fetch"#,
+        r#"x-served-by"#,
+        r#"x-servedby"#,
+        r#"x-server-cache"#,
+        r#"x-server-cookie"#,
+        r#"x-server-etag"#,
+        r#"x-server-id"#,
+        r#"x-server-identity"#,
+        r#"x-server-info"#,
+        r#"x-server-ip"#,
+        r#"x-server-l"#,
+        r#"x-server-name"#,
+        r#"x-server-w"#,
+        r#"x-server"#,
+        r#"x-serverd-by"#,
+        r#"x-servername"#,
+        r#"x-session-id"#,
+        r#"x-sessionid"#,
+        r#"x-sgs-source"#,
+        r#"x-sh-cache-status"#,
+        r#"x-shardid"#,
+        r#"x-shield-request-id"#,
+        r#"x-shopid"#,
+        r#"x-shopify-stage"#,
+        r#"x-shopkit-environment"#,
+        r#"x-shops-show-cache-hit"#,
+        r#"x-shp-request-id"#,
+        r#"x-sid"#,
+        r#"x-simplero-server"#,
+        r#"x-site-speedup"#,
+        r#"x-site"#,
+        r#"x-siteid"#,
+        r#"x-sitename"#,
+        r#"x-so"#,
+        r#"x-songwhip-edge-cache"#,
+        r#"x-soro"#,
+        r#"x-source"#,
+        r#"x-sp-farm"#,
+        r#"x-sp-uniquename"#,
+        r#"x-speed-cache"#,
+        r#"x-sql-calls"#,
+        r#"x-sql-time"#,
+        r#"x-srcache-fetch-status"#,
+        r#"x-srcache-store-status"#,
+        r#"x-srv-ip"#,
+        r#"x-srv"#,
+        r#"x-sso"#,
+        r#"x-ssr-cache-expires"#,
+        r#"x-ssr-cache-refresh-s"#,
+        r#"x-stackifyid"#,
+        r#"x-storage"#,
+        r#"x-stream-path"#,
+        r#"x-stx-cdn"#,
+        r#"x-stx-fetch"#,
+        r#"x-stx-now"#,
+        r#"x-styx-info"#,
+        r#"x-styx-req-id"#,
+        r#"x-sucuri-cache"#,
+        r#"x-sucuri-id"#,
+        r#"x-svr-id"#,
+        r#"x-svr"#,
+        r#"x-swift-cachetime"#,
+        r#"x-swift-savetime"#,
+        r#"x-symfony-cache"#,
+        r#"x-targeo-seoproxy"#,
+        r#"x-tb-optimization-total-bytes-saved"#,
+        r#"x-td-group"#,
+        r#"x-td-idcontent"#,
+        r#"x-thanos"#,
+        r#"x-thinkindot-l1"#,
+        r#"x-time-exec"#,
+        r#"x-time"#,
+        r#"x-timeas"#,
+        r#"x-timer"#,
+        r#"x-timestamp"#,
+        r#"x-timing-wait"#,
+        r#"x-tip"#,
+        r#"x-tlo-hostname"#,
+        r#"x-tm-source"#,
+        r#"x-tncms"#,
+        r#"x-tr"#,
+        r#"x-trace-id"#,
+        r#"x-trace"#,
+        r#"x-traceid"#,
+        r#"x-tracking-id"#,
+        r#"x-tradeindia-request-guid"#,
+        r#"x-trans-id"#,
+        r#"x-transaction-id"#,
+        r#"x-transaction"#,
+        r#"x-transip-backend"#,
+        r#"x-transip-balancer"#,
+        r#"x-true-client-ip"#,
+        r#"x-tserver"#,
+        r#"x-tt-logid"#,
+        r#"x-tt-trace-host"#,
+        r#"x-tt-trace-tag"#,
+        r#"x-tumblr-pixel-0"#,
+        r#"x-tumblr-pixel-1"#,
+        r#"x-tumblr-pixel-2"#,
+        r#"x-tumblr-pixel-2"#,
+        r#"x-tumblr-pixel-3"#,
+        r#"x-tumblr-pixel-4"#,
+        r#"x-tumblr-pixel"#,
+        r#"x-tx-id"#,
+        r#"x-typo3-parsetime"#,
+        r#"x-uber-edge"#,
+        r#"x-ufs-node"#,
+        r#"x-uin"#,
+        r#"x-unbounce-pageid"#,
+        r#"x-unbounce-visitorid"#,
+        r#"x-uniq-id"#,
+        r#"x-unique-id"#,
+        r#"x-unit"#,
+        r#"x-upstream-address"#,
+        r#"x-upstream-ct"#,
+        r#"x-upstream-ht"#,
+        r#"x-upstream-ip"#,
+        r#"x-upstream"#,
+        r#"x-urp"#,
+        r#"x-uuid"#,
+        r#"x-v-cache"#,
+        r#"x-vanilla-version"#,
+        r#"x-var-cache"#,
+        r#"x-var-stor"#,
+        r#"x-varcache"#,
+        r#"x-varcache"#,
+        r#"x-variti-ccr"#,
+        r#"x-varnish-age"#,
+        r#"x-varnish-cache"#,
+        r#"x-varnish-cache"#,
+        r#"x-varnish-debug-age"#,
+        r#"x-varnish-debug-hits"#,
+        r#"x-varnish-debug-ttl"#,
+        r#"x-varnish-host"#,
+        r#"x-varnish-ip"#,
+        r#"x-varnish-secret"#,
+        r#"x-varnish-server"#,
+        r#"x-varnish"#,
+        r#"x-varnishpool"#,
+        r#"x-varnishrequesttime"#,
+        r#"x-vc-age"#,
+        r#"x-vc-cache"#,
+        r#"x-vc"#,
+        r#"x-vcache"#,
+        r#"x-vcap-request-id"#,
+        r#"x-vercel-cache"#,
+        r#"x-vercel-id"#,
+        r#"x-version"#,
+        r#"x-via-cdn"#,
+        r#"x-via-edge"#,
+        r#"x-via-jsl"#,
+        r#"x-via-ssl"#,
+        r#"x-via"#,
+        r#"x-vimeo-dc"#,
+        r#"x-visitor-id"#,
+        r#"x-vserver"#,
+        r#"x-vtex-cache-backend-connect-time"#,
+        r#"x-vtex-cache-backend-header-time"#,
+        r#"x-vtex-cache-server"#,
+        r#"x-vtex-cache-status-janus-apicache"#,
+        r#"x-vtex-cache-time"#,
+        r#"x-vtex-janus-router-backend-app"#,
+        r#"x-vtex-processado-em"#,
+        r#"x-vtex-processed-at"#,
+        r#"x-wadp-cache"#,
+        r#"x-wb-version-expiry"#,
+        r#"x-webcom-cache-status"#,
+        r#"x-webmgr-cache"#,
+        r#"x-webserver"#,
+        r#"x-webstats-respid"#,
+        r#"x-whoami"#,
+        r#"x-whom"#,
+        r#"x-wikidot-backend"#,
+        r#"x-wikidot-static-cache"#,
+        r#"x-wikiloc-cache"#,
+        r#"x-windy-backend"#,
+        r#"x-wish-hostname"#,
+        r#"x-wix-request-id"#,
+        r#"x-wolf-app-server-info"#,
+        r#"x-worker"#,
+        r#"x-wp-cf-super-cache-cookies-bypass"#,
+        r#"x-wp-cf-super-cache"#,
+        r#"x-wp-lb"#,
+        r#"x-ws-request-id"#,
+        r#"x-ws"#,
+        r#"x-wserver"#,
+        r#"x-www-served-by"#,
+        r#"x-x-distributive"#,
+        r#"x-xcar-cache"#,
+        r#"x-xcar-via"#,
+        r#"x-xf-debug-stats"#,
+        r#"x-xff"#,
+        r#"x-xn-trace-token"#,
+        r#"x-yandexuid"#,
+        r#"x-yoda-cache-control"#,
+        r#"x-yottaa-metrics"#,
+        r#"x-yottaa-optimizations"#,
+        r#"x-yp-info"#,
+        r#"x-ys1"#,
+        r#"x-yubin-info"#,
+        r#"x-zalando-child-request-id"#,
+        r#"x-zen-fury"#,
+        r#"x-zipkin-id"#,
+        r#"xhs-request-time"#,
+        r#"y-who"#,
+        r#"yjs-cachestatus"#,
+        r#"yjs-id"#,
+    ].into_iter().collect()
+});
diff --git a/sxg_rs/src/lib.rs b/sxg_rs/src/lib.rs
index 6808364f..ba0b4703 100644
--- a/sxg_rs/src/lib.rs
+++ b/sxg_rs/src/lib.rs
@@ -18,6 +18,7 @@ pub mod fetcher;
 pub mod headers;
 pub mod http;
 mod http_parser;
+mod id_headers;
 mod mice;
 mod ocsp;
 pub mod signature;