[GitHub] [apisix-dashboard] Firstsawyou opened a new issue #1616: [discuss]: when creating a `Service`, `Select Upstream` should be optional, not required

[GitBox]

Firstsawyou opened a new issue #1616:
URL: https://github.com/apache/apisix-dashboard/issues/1616


   # Feature request
   
   ## Please describe your feature
   
   Currently, when creating a `Service` in the Dashboard, it is found that 
`upstream` is a required option. I think this is unreasonable, because when 
creating a service in APISIX, `upstream` is optional, and we should keep the 
configuration consistent with APISIX.
   <img width="1138" alt="截屏2021-03-18 下午5 03 52" 
src="https://user-images.githubusercontent.com/52862365/111600675-9b372680-880c-11eb-95ab-f1824aded21e.png";>
   
   
   For example, in APISIX, when we only need to use the plug-in on the service, 
upstream may not be configured.
   
   ```shell
   curl http://127.0.0.1:9080/apisix/admin/services/1 -H 'X-API-KEY: 
edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
   {
       "name": "my_service",
       "plugins": {
           "limit-count": {
               "count": 2,
               "time_window": 10,
               "rejected_code": 503,
               "key": "remote_addr"
           }
       }
   }'
   ```
   
   ```shell
   curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: 
edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
   {
       "name": "my_route",
       "uri": "/hello",
       "service_id": 1,
       "upstream": {
           "nodes": {
               "127.0.0.1:1980": 1
           },
           "type": "roundrobin"
       }
   }'
   ```
   
   ```shell
   curl http://127.0.0.1:9080/hello -v
   * About to connect() to 127.0.0.1 port 9080 (#0)
   *   Trying 127.0.0.1...
   * Connected to 127.0.0.1 (127.0.0.1) port 9080 (#0)
   > GET /hello HTTP/1.1
   > User-Agent: curl/7.29.0
   > Host: 127.0.0.1:9080
   > Accept: */*
   > 
   < HTTP/1.1 200 OK
   < Content-Type: application/octet-stream
   < Transfer-Encoding: chunked
   < Connection: keep-alive
   < X-RateLimit-Limit: 2
   < X-RateLimit-Remaining: 1
   < Date: Thu, 18 Mar 2021 08:40:35 GMT
   < Server: APISIX/2.3
   < 
   1980
   ```
   
   ## Describe the solution you'd like
   
   When creating a `Service`, `Select Upstream` should be optional.
   


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