feat: allow grpc web in non prefix based routes

Signed-off-by: Abhishek Choudhary <shreemaan.abhishek@gmail.com>

Author: shreemaan-abhishek

apisix/plugins/grpc-web.lua

@@ -43,7 +43,7 @@ local schema = {
     properties = {
         cors_allow_headers = {
             description =
-                "multiple header use ',' to split. default: content-type,x-grpc-web,x-user-agent.",
+            "multiple header use ',' to split. default: content-type,x-grpc-web,x-user-agent.",
             type = "string",
             default = DEFAULT_CORS_ALLOW_HEADERS
         }
@@ -134,20 +134,14 @@ function _M.access(conf, ctx)
     -- set context variable encoding method
     ctx.grpc_web_encoding = encoding
 
-    -- set grpc path
-    if not (ctx.curr_req_matched and ctx.curr_req_matched[":ext"]) then
-        core.log.error("routing configuration error, grpc-web plugin only supports ",
-            "`prefix matching` pattern routing")
-        return exit(ctx, 400)
-    end
-
     local path = ctx.curr_req_matched[":ext"]
-    if path:byte(1) ~= core.string.byte("/") then
-        path = "/" .. path
+    if path and path ~= "" then
+        if path:byte(1) ~= core.string.byte("/") then
+            path = "/" .. path
+        end
+        req_set_uri(path)
     end
 
-    req_set_uri(path)
-
     -- set grpc body
     local body, err = core.request.get_body()
     if err or not body then

t/plugin/grpc-web.t

@@ -137,7 +137,7 @@ request Content-Type: `application/json` invalid
         content_by_lua_block {
 
             local config = {
-                uri = "/grpc/web2/a6.RouteService/GetRoute",
+                uri = "/grpc/web/a6.RouteService/GetRoute",
                 upstream = {
                     scheme = "grpc",
                     type = "roundrobin",
@@ -168,16 +168,14 @@ passed
 
 === TEST 8: test route (absolute match)
 --- request
-POST /grpc/web2/a6.RouteService/GetRoute
+POST /grpc/web/a6.RouteService/GetRoute
+hello
 --- more_headers
 Content-Type: application/grpc-web
---- error_code: 400
+--- error_code: 200
 --- response_headers
 Access-Control-Allow-Origin: *
-Content-Type: text/html
---- error_log
-routing configuration error, grpc-web plugin only supports `prefix matching` pattern routing
-
+Content-Type: application/grpc-web
 
 
 === TEST 9: set route (with cors plugin)