fabiograsso commented on issue #1539: Will ngx_pagespeed affect the use of http 
/ 2 server push?
URL: 
https://github.com/apache/incubator-pagespeed-ngx/issues/1539#issuecomment-377493375
 
 
   I've tried using hint_preload_subresources but I've found that the Link 
header are sent with the "nopush" attribute
   
   This is also what's reported on example in PageSpeed documentation: 
https://www.modpagespeed.com/doc/filter-hint-preload-subresources
   
   > Then PageSpeed will add the following HTTP headers to the page:
   > 
   > ```
   > link: </styles_all_styles.css>; rel=preload; as=style; nopush
   > link: </basic.css>; rel=preload; as=style; nopush
   > link: </fancy.css>; rel=preload; as=style; nopush
   > link: </script.js>; rel=preload; as=script; nopush
   > ```
   
   According to [nginx 
documentation](https://www.nginx.com/blog/nginx-1-13-9-http2-server-push/):
   
   > If you don’t want NGINX to push a preloaded resource, add a nopush 
parameter to the header:
   > 
   > ```
   > # Resource is not pushed
   > Link: </nginx.png>; as=image; rel=preload; nopush
   > ```
   
   I don't know if there is a way for setup PageSpeed in order to not send the 
"nopush" but if not it's normal for the push to fail, and it's working as 
expected. I wonder why this choice to put nopush in the headers.

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