fix(request-id): we can use different ids with the same request

apisix/plugins/request-id.lua

@@ -49,7 +49,7 @@ function _M.rewrite(conf, ctx)
     end
 
     if conf.include_in_response then
-        ctx.x_request_id = uuid_val
+        ctx["request-id-" .. conf.header_name] = uuid_val
     end
 end
 
@@ -61,7 +61,7 @@ function _M.header_filter(conf, ctx)
 
     local headers = ngx.resp.get_headers()
     if not headers[conf.header_name] then
-        core.response.set_header(conf.header_name, ctx.x_request_id)
+        core.response.set_header(conf.header_name, ctx["request-id-" .. conf.header_name])
     end
 end
 

t/plugin/request-id.t

@@ -387,3 +387,86 @@ GET /t
 request header not present
 --- no_error_log
 [error]
+
+
+
+=== TEST 10: add plugin with custom header name in global rule and add plugin with default header name in specific route
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/global_rules/1',
+                ngx.HTTP_PUT,
+                     [[{
+                        "plugins": {
+                            "request-id": {
+                                "header_name":"Custom-Header-Name"
+                            }
+                        }
+                }]]
+                )
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+            local code, body = t('/apisix/admin/routes/1',
+                ngx.HTTP_PUT,
+                    [[{
+                        "plugins": {
+                            "request-id": {
+                            }
+                        },
+                        "upstream": {
+                            "nodes": {
+                                "127.0.0.1:1982": 1
+                            },
+                            "type": "roundrobin"
+                        },
+                        "uri": "/opentracing"
+                }]]
+                )
+            if code >= 300 then
+                ngx.status = code
+                return
+            end
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+--- no_error_log
+[error]
+
+
+=== TEST 11: check for multiple request-ids in the response header are different
+--- config
+    location /t {
+        content_by_lua_block {
+            local http = require "resty.http"
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/opentracing"
+            local res, err = httpc:request_uri(uri,
+                {
+                    method = "GET",
+                    headers = {
+                        ["Content-Type"] = "application/json",
+                    }
+                })
+
+            if res.headers["X-Request-Id"] and res.headers["Custom-Header-Name"] and res.headers["X-Request-Id"] ~= res.headers["Custom-Header-Name"] then
+                ngx.say("X-Request-Id and Custom-Header-Name is different")
+            else
+                ngx.say("failed")
+            end
+        }
+    }
+--- request
+GET /t
+--- response_body
+X-Request-Id and Custom-Header-Name is different
+--- no_error_log
+[error]
+