Is there a way I can force tinyweb to push out the response content before the end of

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Force push response content out? about tinyweb HOT 4 CLOSED

belyalov commented on May 18, 2024

Force push response content out?

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Comments (4)

jimmo commented on May 18, 2024 1

I looked at this from the MicroPython uasyncio side. Using the tinyweb's examples/hello_world.py example, but with some sleeps shows the behavior @UnexpectedMaker describes, however if you connect manually (e.g. via telnet) you can see that the data is flushed immediately. This is just how browsers work. It seems that you need to get past some minimum number of bytes in the response before the browser will start rendering the page, e.g. this works fine:

@app.route('/')
async def index(request, response):
    # Start HTTP response with content-type text/html
    await response.start_html()
    # Send actual HTML page
    await response.send('<html><body><h1>Hello</h1>\n')
    await response.send(' ' * 1024)   # <-- Make the browser start rendering.
    for _ in range(5):
      await uasyncio.sleep(5)
      await response.send('<h2>hello</h2>\n')
    await response.send('</html>\n')

FYI @belyalov , MicroPython is going to release a new version of uasyncio soon. See micropython/micropython#5332
Unfortunately this will break TinyWeb due to some internal dependencies it has on (for example uasyncio.IORead ) For the most part, moving to uasyncio.start_server will solve this.

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belyalov commented on May 18, 2024

@UnexpectedMaker: @jimmo is right - this is how browser works.

Usually, to force browser to show/process received data immediately either chunks or close connection could be used.

So you can try to switch your handler to be generator (to force tinyweb to use Transfer-Encoding: chunked), like this:

async def something():
    yield '<h2>Credentials saved!</h2><br>You can now close this page...'
    yield html.format(self.web_title, st_str)
    # ...

test: https://github.com/belyalov/tinyweb/blob/master/test/test_server.py#L283
implementation: https://github.com/belyalov/tinyweb/blob/master/tinyweb/server.py#L327

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belyalov commented on May 18, 2024

FYI @belyalov , MicroPython is going to release a new version of uasyncio soon. See micropython/micropython#5332
Unfortunately this will break TinyWeb due to some internal dependencies it has on (for example uasyncio.IORead ) For the most part, moving to uasyncio.start_server will solve this.

This is actually great - I'll adapt tinyweb once PR merged.
Thanks

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UnexpectedMaker commented on May 18, 2024

Yeah, new asyncio looks promising and much easier for noobs like me to grok!
Thanks for your help on this issue @belyalov and @jimmo - working great now, so closing it!

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Force push response content out? about tinyweb HOT 4 CLOSED

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