membphis commented on a change in pull request #2239:
URL: https://github.com/apache/apisix/pull/2239#discussion_r490681896



##########
File path: apisix/plugins/hmac-auth.lua
##########
@@ -182,13 +201,25 @@ local function generate_signature(ctx, secret_key, params)
         canonical_query_string = core.table.concat(query_tab, "&")
     end
 
-    local req_body = core.request.get_body()
-    req_body = req_body or ""
+    local canonical_headers = ""
+
+    core.log.info("all headers: ", core.json.encode(core.request.headers(), 
true))
+
+    for _, h in pairs(params.signed_headers) do
+        canonical_headers = canonical_headers .. (core.request.header(ctx, h) 
or "")

Review comment:
       I helped you fix it. you can take a look when you have time




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