Chromium settings in headless mode

[xivan...@gmail.com]

Hello, 

i'm trying to turn off images loading through Chromium settings (chrome://settings).

Is it possible to use this settings with --headless flag?

I have tried the following, but got no success:

1. Make empty dir

2. Run Chromium UI with --user-data-dir key referring to dir from p1

3. Configure something through chrome://settings (in my case it was Advanced -> Content Settings -> Images -> Do not show any images = True)

4. Run Chromium in headless mode with same --user-data-dir

5. Load some page (chrome debugging api in my case), observe that images still loading (tcpdump)

Tested on Linux Chromium 58.0.3029.0.

[Eric Seckler]

Such settings are not supported in headless mode at the moment. (This is because the headless architecture is based on the content layer and does not include embedder-specific functionality from chrome.)

Alex mentioned here that you could alternatively use a custom proxy or C++ protocol handlers to block images. We are also thinking about adding functionality to DevTools that would allow blocking resources.

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[Sami Kyostila]

You could also override the corresponding WebPreference that disables image loading.

- Sami

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[xivan...@gmail.com]

Guys, thank you for explanations and suggestions.

I have overridden corresponding setting with --blink-settings=imagesEnabled=false command line argument and it just works.

However "imagesEnabled" functionality is not generic, it would be nice if there will be some way to block resources using debugging api.

For an instance "ads blocking" case requires more control over network requests.

[Alex Clarke]

On 10 March 2017 at 05:11, <xivan...@gmail.com> wrote:

Guys, thank you for explanations and suggestions.

I have overridden corresponding setting with --blink-settings=imagesEnabled=false command line argument and it just works.

However "imagesEnabled" functionality is not generic, it would be nice if there will be some way to block resources using debugging api.

This is a common request. We're thinking about adding some devtools commands to allow fine grained blocking and modification of requests. Or plans need a little more time to bake,  but later I hope to post a link to a design doc and tracking bug.

 

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[Georgios Diamantopoulos]

In the meantime, how would one go about overriding network request "stuff"?

[Sami Kyostila]

Have a look at the example protocol handlers under headless/, e.g.:

https://cs.chromium.org/chromium/src/headless/public/util/in_memory_protocol_handler.h?rcl=33939c01a9cc0064f9a9a50060af1036c5b86ae1&l=14

- Sami