Configure Google App Engine yaml file to handle 404 Error - google-app-engine

Question

After the deployment of my application on Google App Engine every things works like a charm , I can access all pages but when I refresh I receive a 404 error
Example : when refreching https://my-app...appspot.com/create-ad throw 404 not found
I tried
Angular 6 routes not found on Google App Engine
and
How to configure Google App Engine yaml file to handle 404 Error
but same result
This on my app.yml
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /
static_files: dist/index.html
upload: dist/index.html
- url: /
static_dir: dist
- url: /.*
static_files: dist/index.html
upload: dist/index.html
skip_files:
- ^.*node_modules(/.*)?
- ^.*json_data(/.*)?
- ^.*e2e(/.*)?
and also tried this app.yml config to redirect all url to index.html
runtime: python27
api_version: 1
threadsafe: false
service: frontend-accept
handlers:
- url: /
static_files: dist/index.html
upload: dist/index.html
- url: /
static_dir: dist
- url: /.*
script: main.py
skip_files:
- ^.*node_modules(/.*)?
- ^.*json_data(/.*)?
- ^.*e2e(/.*)?
this is my main.py
import webapp2
app = webapp2.WSGIApplication()
class RedirectToHome(webapp2.RequestHandler):
def get(self, path):
self.redirect('/dist/index.html')
routes = [
RedirectRoute('/<path:.*>', RedirectToHome),
]
for r in routes:
app.router.add(r)
But always get 404 when refreshing the page
Any help? Thanks

Answer 1

The reason of the 404 HTTP error code is due to this handlers:
- url:
static_dir: dist
As stated in the Google App Engine official documentation, using static_dir: dist causes that all URLs beginning with the / pattern are treated as paths to static files in the /dist directory, so for example every time you call the URL /whatever the application will look for the file /dist/whatever, since it doesn’t exist you get the 404 error.
I believe that the following code will work as you are expecting:
runtime: python27
api_version: 1
threadsafe: true
handlers:
- url: /
static_files: dist/index.html
upload: dist/index.html
- url: /dist/index.html
static_files: dist/index.html
upload: dist/index.html
- url: /.*
script: main.app
skip_files:
- ^.*node_modules(/.*)?
- ^.*json_data(/.*)?
- ^.*e2e(/.*)?
The handler for the / endpoint will serve the dist/index.html file, as well as the /dist/index.html endpoint.
Handlers are checked sequentially and if none of the above handlers have been called then any URL matching the pattern /.* ( which is all of them) will call the main.app script (this will basically override the 404 error message).
This script is redirecting you to the /dist/index.html endpoint, so this is the reason why it needs to be handled in the yaml file.
As a final point I had to import webapp2_extras.routes to use RedirectRoute in the main.py.

Answer 2

finally the solution was to configure the app.yml properly
runtime: python27
api_version: 1
threadsafe: true
skip_files:
- ^(?!dist) # Skip any files not in the dist folder
handlers:
- url: /((?:runtime|main|polyfills|styles|vendor)\.[a-z0-9]+\.js)
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /((?:runtime|main|polyfills|styles|vendor)\.[a-z0-9]+\.js\.map)
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /(styles\.[a-z0-9]+\.css)
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /((?:assets|docs)/.*|favicon\.ico)
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /(manifest\.json|ngsw\.json|ngsw-worker\.js|safety-worker\.js|worker-basic\.min\.js|ngsw_worker\.es6\.js\.map)
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /(.*\.woff)
mime_type: application/x-font-woff
secure: always
redirect_http_response_code: 301
static_files: dist/browser/\1
upload: dist/browser/.*
- url: /.*
secure: always
redirect_http_response_code: 301
static_files: dist/browser/index.html
upload: dist/browser/index\.html
http_headers:
Strict-Transport-Security: max-age=31536000; includeSubDomains
X-Frame-Options: DENY