https problem on FreeBSD

[beyondcreed]

I am running into issue when trying to render https based URL's. http works fine. Also chrome in headless can deal with https and spits out DOM, for example when I run: chrome --headless --disable-gpu --dump-dom https://www.apple.com

My prerender curl request is as follows:

curl -v http://myserver.com:8000/https://www.apple.com

Below is output from prerender:

[root@node295 ~]# prerender
2017-08-16 18:37:40 - (sanic)[DEBUG]:
\u2584\u2584\u2584\u2584\u2584
\u2580\u2580\u2580\u2588\u2588\u2588\u2588\u2588\u2588\u2584\u2584\u2584 _______________
\u2584\u2584\u2584\u2584\u2584 \u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2584 /
\u2580\u2580\u2580\u2580\u2588\u2588\u2588\u2588\u2588\u258c \u2580\u2590\u2584 \u2580\u2590\u2588 | Gotta go fast! |
\u2580\u2580\u2588\u2588\u2588\u2588\u2588\u2584\u2584 \u2580\u2588\u2588\u2588\u2588\u2588\u2588\u2584\u2588\u2588 | _________________/
\u2580\u2584\u2584\u2584\u2584\u2584 \u2580\u2580\u2588\u2584\u2580\u2588\u2550\u2550\u2550\u2550\u2588\u2580 |/
\u2580\u2580\u2580\u2584 \u2580\u2580\u2588\u2588\u2588 \u2580 \u2584\u2584
\u2584\u2588\u2588\u2588\u2580\u2580\u2588\u2588\u2584\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2584 \u2584\u2580\u2580\u2580\u2580\u2580\u2580\u2588\u258c
\u2588\u2588\u2580\u2584\u2584\u2584\u2588\u2588\u2580\u2584\u2588\u2588\u2588\u2580 \u2580\u2580\u2588\u2588\u2588\u2588 \u2584\u2588\u2588
\u2584\u2580\u2580\u2580\u2584\u2588\u2588\u2584\u2580\u2580\u258c\u2588\u2588\u2588\u2588\u2592\u2592\u2592\u2592\u2592\u2592\u2588\u2588\u2588 \u258c\u2584\u2584\u2580
\u258c \u2590\u2580\u2588\u2588\u2588\u2588\u2590\u2588\u2588\u2588\u2592\u2592\u2592\u2592\u2592\u2590\u2588\u2588\u258c
\u2580\u2584\u2584\u2584\u2584\u2580 \u2580\u2580\u2588\u2588\u2588\u2588\u2592\u2592\u2592\u2592\u2584\u2588\u2588\u2580
\u2580\u2580\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2580
\u2584\u2584\u2588\u2588\u2580\u2588\u2588\u2588\u2588\u2588\u2588\u2580\u2588
\u2584\u2588\u2588\u2580 \u2580\u2580\u2580 \u2588
\u2584\u2588 \u2590\u258c
\u2584\u2584\u2584\u2584\u2588\u258c \u2580\u2588\u2584\u2584\u2584\u2584\u2580\u2580\u2584
\u258c \u2590 \u2580\u2580\u2584\u2584\u2584\u2580
\u2580\u2580\u2584\u2584\u2580

2017-08-16 18:37:40 - (sanic)[INFO]: Goin' Fast @ http://0.0.0.0:8000
2017-08-16 18:37:40,712 INFO prerender.chromerdp.new_page:47 Created new page 990b1656-05b1-4c93-9909-3299d31579b3
2017-08-16 18:37:40,723 INFO prerender.chromerdp.new_page:47 Created new page 083237b6-e7bf-4e44-97ea-a91312e636f1
2017-08-16 18:37:40,728 INFO prerender.chromerdp.new_page:47 Created new page b81c0ec4-e4a8-489c-a1be-ecd869aa861a
2017-08-16 18:37:40,735 INFO prerender.chromerdp.new_page:47 Created new page cf6d747f-d71f-4519-a74b-6a4f43e29353
2017-08-16 18:37:40,739 INFO prerender.chromerdp.new_page:47 Created new page 5272d7fd-44ed-45ff-b2c3-448fb214e29e
2017-08-16 18:37:40,747 INFO prerender.chromerdp.new_page:47 Created new page 5aac2038-452a-4b56-8e0b-a9a6fc03a8ed
2017-08-16 18:37:40,849 INFO prerender.chromerdp.new_page:47 Created new page 5d9d66ef-c68b-45b8-8e2a-711fa070a972
2017-08-16 18:37:40,863 INFO prerender.chromerdp.new_page:47 Created new page 5402ba0f-3ebd-4579-bc18-f20743deaf4e
2017-08-16 18:37:40,895 INFO prerender.chromerdp.new_page:47 Created new page ec42cd61-49ca-4319-82e4-42cffa53cd8f
2017-08-16 18:37:41,009 INFO prerender.chromerdp.new_page:47 Created new page 019aa698-ae0d-4e08-987c-63547ecd134d
2017-08-16 18:37:41,015 INFO prerender.chromerdp.new_page:47 Created new page 64d86146-6092-4b72-bbd4-c8af5e0acc66
2017-08-16 18:37:41,039 INFO prerender.chromerdp.new_page:47 Created new page fd4bb779-ee77-4ad3-8468-94348c2fda3c
2017-08-16 18:37:41,141 INFO prerender.chromerdp.new_page:47 Created new page 92221c66-8fdc-4494-a0d8-4e432fe805ee
2017-08-16 18:37:41,145 INFO prerender.chromerdp.new_page:47 Created new page 54c984c2-f04e-4b84-a267-7fb4babf9430
2017-08-16 18:37:41,198 INFO prerender.chromerdp.new_page:47 Created new page a6f6d228-4d64-4caf-906d-5ed701d019f4
2017-08-16 18:37:41,203 INFO prerender.chromerdp.new_page:47 Created new page 77111530-da40-48fc-9259-da08aa97972f
2017-08-16 18:37:41 - (sanic)[INFO]: Starting worker [95309]
2017-08-16 18:37:41,204 INFO sanic.serve:526 Starting worker [95309]
2017-08-16 18:42:07,854 INFO prerender.chromerdp.navigate:218 Page 990b1656-05b1-4c93-9909-3299d31579b3 [1] navigating to https://www.apple.com
2017-08-16 18:42:37,858 INFO websockets.protocol.fail_connection:618 Failing the WebSocket connection: 1006
2017-08-16 18:42:37,859 WARNING prerender.app._render:99 Temporary browser failure: , retry rendering https://www.apple.com in 1s
2017-08-16 18:42:37,871 ERROR asyncio.serve:527 Task exception was never retrieved
future: <Task finished coro=<Page._evaluate_prerender_ready() done, defined at /usr/local/lib/python3.6/site-packages/prerender/chromerdp.py:232> exception=AttributeError("'NoneType' object has no attribute 'send'",)>
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 234, in _evaluate_prerender_ready
res = await self.evaluate('window.prerenderReady == true')
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 228, in evaluate
'params': {'expression': expr}
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 178, in send
await self.websocket.send(json.dumps(payload))
AttributeError: 'NoneType' object has no attribute 'send'
2017-08-16 18:42:38,865 INFO prerender.chromerdp.navigate:218 Page 083237b6-e7bf-4e44-97ea-a91312e636f1 [1] navigating to https://www.apple.com
2017-08-16 18:43:07 - (sanic)[ERROR]: Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/sanic/server.py", line 143, in connection_timeout
raise RequestTimeout('Request Timeout')
sanic.exceptions.RequestTimeout: Request Timeout

2017-08-16 18:43:07,848 ERROR sanic.log:104 Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/sanic/server.py", line 143, in connection_timeout
raise RequestTimeout('Request Timeout')
sanic.exceptions.RequestTimeout: Request Timeout

2017-08-16 18:43:07,853 INFO websockets.protocol.fail_connection:618 Failing the WebSocket connection: 1006
2017-08-16 18:43:07,853 WARNING prerender.app.handle_request:201 Got 504 for https://www.apple.com in 60001ms
2017-08-16 18:43:07 - (sanic)[ERROR]: Connection lost before response written @ ('96.50.156.110', 18006)
2017-08-16 18:43:07,854 ERROR sanic.write_response:267 Connection lost before response written @ ('96.50.156.110', 18006)
2017-08-16 18:43:07,890 ERROR asyncio.serve:527 Task exception was never retrieved
future: <Task finished coro=<Page._evaluate_prerender_ready() done, defined at /usr/local/lib/python3.6/site-packages/prerender/chromerdp.py:232> exception=AttributeError("'NoneType' object has no attribute 'send'",)>
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 234, in _evaluate_prerender_ready
res = await self.evaluate('window.prerenderReady == true')
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 228, in evaluate
'params': {'expression': expr}
File "/usr/local/lib/python3.6/site-packages/prerender/chromerdp.py", line 178, in send
await self.websocket.send(json.dumps(payload))
AttributeError: 'NoneType' object has no attribute 'send'

[messense]

WARNING prerender.app._render:99 Temporary browser failure: , retry rendering https://www.apple.com in 1s

Seems like that prerender can't connect to your headless Chrome instance.

What's your Chrome version? How did you start it?

[beyondcreed]

wow, fast response 👍

it works fine with http based URL, for example if I do

curl -v http://myserver.com:8000/http://www.somesite.com

then it works fine, just doesn't like https

chrome is Chromium 59.0.3071.115, it's started like this chrome --headless --remote-debugging-port=9222 --disable-gpu "about:blank" as per your instructions in README

[messense]

Might related to #13

[messense]

Can you try prerender https://www.apple.com/mac/ ?

[beyondcreed]

unfortantely this does not help, we need it to run with --headless as this is in server environment for rendering our SPA's

[messense]

The problem is with how we use layerPainted event, not --headless, I tried prerender https://www.apple.com/mac/ and it worked.

https://www.apple.com/ has something producing layerPainted event constantly causing prerender timeout.

[beyondcreed]

ok I inferred it was --headless switch from someone mentioning it on the ticket link you sent. so what you are saying its layerPainted?, but how come I can do this chrome --headless --disable-gpu --dump-dom https://www.apple.com it works fine.

also other https targets have same problem, for example if I do

curl -v http://myserver.com:8000/https://www.google.com same problem

it seems something else is problematic with https and how prerender works with this possibly

[messense]

Because in prerender it tries to infer when the page has done rendering. There are several methods:

1. evaluate window.prerenderReady == true
2. count finished network requests
3. wait for DOM tree has no changes in 1s

The last one can be problematic when the page constantly modify DOM like Apple homepage do. (If you SPA don't do that it should work fine)

[messense]

That said, I would recommend you to try to prerender your SPA instead of Apple/Google page.

[beyondcreed]

our SPA does not work as well, we were hoping we would be able to try it out instead of using our existing PhantomJS + Prerender.IO setup, which works fine.

[messense]

So you SPA has the same issue?

[beyondcreed]

We may have to look at puppeteer instead, https://github.com/GoogleChrome/puppeteer#readme

but we will likely need to re-implement some of functionality which you already have here

[beyondcreed]

Yes our SPA has same issue

[messense]

@beyondcreed Try comment out https://github.com/bosondata/chrome-prerender/blob/master/prerender/chromerdp.py#L152 to see if it helps. Thanks!

I got it work for Apple homepage.