即使修改了HTML页面，App引擎仍返回304

Question

I have an angular js app whose main container page "index.html" is updated each version. This is hosted in app-engine that I've built using Go. The server end offers straight serving of the html views and the static content as well as a restful API.

It all works great until I push a new version then I have to hard reload the page to avoid getting a 304.

My app.yaml file is really basic right now:

handlers:
- url: /.*
  script: _go_app

I'm not setting any caching policies yet so I understand app engine will default the caching of static files for 10 minutes.

What's happening?

Answer 1

I believe I have found the answer.

Two things were bothering me about this:

Firstly, I knew I wasn't handling static files as efficiently as I could have been, it was a job I hadn't gotten around to yet but the static files were being delivered via routing code in the main go script rather than declared in the app.yaml

Using the latter method would let app engine do the work rather than my script and hopefully save a few precious processor cycles.

Secondly I wasn't exactly sure how index.html was being served when the path was "/", it was just working. I know that various web servers (Apache, IIS, etc) have a default page and app engine seemed to be working the same way.

So when I was deciding that each request didn't require any dynamic script I would simply serve it with the following code:

http.ServeFile(w, r, r.URL.Path[1:])

This magically turned "/" into "/index.html" for me but appears to have the caching bug described above. I will take this up with the Go community.

As for the fix, adding the page as a static file to the app.yaml made this work:

- url: /
  static_files: index.html
  upload: index.html

I will make sure I add all the other static folders too.