GAE Cloud Endpoints API Explorer stopped working

Out of the blue, the API explorer (localhost:8080/_ah/api/explorer) stopped working. This is the message it gives:

WARNING  2015-12-15 17:54:24,744 dispatcher.py:762] Skipping dispatch.yaml rules because /_ah/spi/BackendService.getApiConfigs is not a dispatchable path.
2015/12/15 17:54:24 DEBUG: SPI request body: {}
INFO     2015-12-15 17:54:24,746 module.py:787] default: "POST /_ah/spi/BackendService.getApiConfigs HTTP/1.1" 200 2619
ERROR    2015-12-15 17:54:25,706 discovery_api_proxy.py:59] Discovery API proxy failed on /_ah/api/discovery/v1/apis/generate/directory with 400.
Request: {"configs": ["{\"name\": \"test\", \"abstract\": false, \"methods\": {\"test.load_test_data\": {\"path\": \"testData\", \"response\": {\"body\": \"empty\"}, \"rosyMethod\": \"TestAPI.LoadTestData\", \"request\": {\"body\": \"empty\"}, \"httpMethod\": \"POST\"}, \"test.test\": {\"path\": \"test\", \"response\": {\"body\": \"autoTemplate(backendResponse)\", \"bodyName\": \"resource\"}, \"rosyMethod\": \"TestAPI.Test\", \"request\": {\"body\": \"empty\"}, \"httpMethod\": \"GET\"}, \"test.showdata4\": {\"path\": \"showdata4\", \"response\": {\"body\": \"autoTemplate(backendResponse)\", \"bodyName\": \"resource\"}, \"rosyMethod\": \"TestAPI.ShowData4\", \"request\": {\"body\": \"autoTemplate(backendRequest)\", \"bodyName\": \"resource\"}, \"httpMethod\": \"POST\"}, \"test.showdata\": {\"path\": \"showdata\", \"response\": {\"body\": \"autoTemplate(backendResponse)\", \"bodyName\": \"resource\"}, \"rosyMethod\": \"TestAPI.ShowData\", \"request\": {\"body\": \"empty\"}, \"httpMethod\": \"GET\"}, \"test.showdata3\": {\"path\": \"showdata3\", \"response\": {\"body\": \"autoTemplate(backendResponse)\", \"bodyName\": \"resource\"}, \"rosyMethod\": \"TestAPI.ShowData3\", \"request\": {\"body\": \"empty\"}, \"httpMethod\": \"GET\"}, \"test.showdata2\": {\"path\": \"showdata2\", \"response\": {\"body\": \"autoTemplate(backendResponse)\", \"bodyName\": \"resource\"}, \"rosyMethod\": \"TestAPI.ShowData2\", \"request\": {\"body\": \"empty\"}, \"httpMethod\": \"GET\"}}, \"descriptor\": {\"methods\": {\"TestAPI.ShowData2\": {\"response\": {\"$ref\": \"OutputResp\"}}, \"TestAPI.ShowData3\": {\"response\": {\"$ref\": \"OutputResp\"}}, \"TestAPI.ShowData4\": {\"request\": {\"$ref\": \"InputReq\"}, \"response\": {\"$ref\": \"OResp\"}}, \"TestAPI.Test\": {\"response\": {\"$ref\": \"OutputResp\"}}, \"TestAPI.LoadTestData\": {}, \"TestAPI.ShowData\": {\"response\": {\"$ref\": \"OutputResp\"}}}, \"schemas\": {\"ValueResp\": {\"type\": \"object\", \"id\": \"ValueResp\", \"properties\": {\"attrs\": {}, \"value\": {\"type\": \"string\"}}}, \"OResp\": {\"type\": \"object\", \"id\": \"OResp\", \"properties\": {\"entries\": {\"items\": {\"$ref\": \"ItemResp\"}, \"type\": \"array\"}}}, \"OutputResp\": {\"type\": \"object\", \"id\": \"OutputResp\", \"properties\": {\"text\": {\"type\": \"string\"}}}, \"InputReq\": {\"type\": \"object\", \"id\": \"InputReq\", \"properties\": {\"text\": {\"type\": \"string\"}}}, \"ItemResp\": {\"type\": \"object\", \"id\": \"ItemResp\", \"properties\": {\"values\": {\"items\": {\"$ref\": \"ValueResp\"}, \"type\": \"array\"}}}}}, \"version\": \"v1\", \"extends\": \"thirdParty.api\", \"defaultVersion\": true, \"root\": \"http://localhost:8082/_ah/api\", \"adapter\": {\"bns\": \"http://localhost:8082/_ah/spi\", \"type\": \"lily\"}, \"description\": \"test api\"}"]}
Response: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "invalid",
    "message": "Invalid Value"
   }
  ],
  "code": 400,
  "message": "Invalid Value"
 }
}

ERROR    2015-12-15 17:54:25,706 discovery_service.py:141] Failed to get API directory
INFO     2015-12-15 17:54:25,706 module.py:787] default: "GET /_ah/api/discovery/v1/apis HTTP/1.1" 404 9

That crazy request... where does it come from? I've commented the registering part in my backend. Is it cached somewhere? Tried eliminating all cookies, changed browsers, and the same happens. It seems to have all the registered services from the beginning of time. I've looked everywhere and could not find where are those stored.

My app (localhost:8080) does not work either, with the same problem.

http://stackoverflow.com/questions/34296456/gae-cloud-endpoints-api-explorer-stopped-working

GoogleCloudPlatform / go-endpoints

GAE Cloud Endpoints API Explorer stopped working #130