diff --git a/cmd/http-gw/app.go b/cmd/http-gw/app.go
index 1d12122..3d02faa 100644
--- a/cmd/http-gw/app.go
+++ b/cmd/http-gw/app.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -534,15 +535,15 @@ func (a *app) configureRouter(handler *handler.Handler) {
 		response.Error(r, "Method Not Allowed", fasthttp.StatusMethodNotAllowed)
 	}
 
-	r.POST("/upload/{cid}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.Upload)))))
+	r.POST("/upload/{cid}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.Upload))))))
 	a.log.Info(logs.AddedPathUploadCid)
-	r.GET("/get/{cid}/{oid:*}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadByAddressOrBucketName)))))
-	r.HEAD("/get/{cid}/{oid:*}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.HeadByAddressOrBucketName)))))
+	r.GET("/get/{cid}/{oid:*}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadByAddressOrBucketName))))))
+	r.HEAD("/get/{cid}/{oid:*}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.HeadByAddressOrBucketName))))))
 	a.log.Info(logs.AddedPathGetCidOid)
-	r.GET("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadByAttribute)))))
-	r.HEAD("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.HeadByAttribute)))))
+	r.GET("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadByAttribute))))))
+	r.HEAD("/get_by_attribute/{cid}/{attr_key}/{attr_val:*}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.HeadByAttribute))))))
 	a.log.Info(logs.AddedPathGetByAttributeCidAttrKeyAttrVal)
-	r.GET("/zip/{cid}/{prefix:*}", a.logger(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadZipped)))))
+	r.GET("/zip/{cid}/{prefix:*}", a.logger(a.canonicalizer(a.tokenizer(a.tracer(a.reqNamespace(handler.DownloadZipped))))))
 	a.log.Info(logs.AddedPathZipCidPrefix)
 
 	a.webServer.Handler = r.Handler
@@ -559,6 +560,38 @@ func (a *app) logger(h fasthttp.RequestHandler) fasthttp.RequestHandler {
 	}
 }
 
+func (a *app) canonicalizer(h fasthttp.RequestHandler) fasthttp.RequestHandler {
+	return func(req *fasthttp.RequestCtx) {
+		// regardless of DisableHeaderNamesNormalizing setting, some headers
+		// MUST be normalized in order to process execution. They are normalized
+		// here.
+
+		toAddKeys := make([][]byte, 0, 10)
+		toAddValues := make([][]byte, 0, 10)
+		prefix := []byte(utils.UserAttributeHeaderPrefix)
+
+		req.Request.Header.VisitAll(func(k, v []byte) {
+			if bytes.HasPrefix(k, prefix) {
+				return
+			}
+			toAddKeys = append(toAddKeys, k)
+			toAddValues = append(toAddValues, v)
+		})
+
+		// this is safe to do after all headers were read into header structure
+		req.Request.Header.EnableNormalizing()
+
+		for i := range toAddKeys {
+			req.Request.Header.SetBytesKV(toAddKeys[i], toAddValues[i])
+		}
+
+		// return normalization setting back
+		req.Request.Header.DisableNormalizing()
+
+		h(req)
+	}
+}
+
 func (a *app) tokenizer(h fasthttp.RequestHandler) fasthttp.RequestHandler {
 	return func(req *fasthttp.RequestCtx) {
 		appCtx, err := tokens.StoreBearerTokenAppCtx(a.ctx, req)