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WebPerf What is this probability="1.0" ?

Discussion in 'Web Development & Web Performance' started by rdan, Oct 8, 2019.

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  1. Oct 8, 2019 #1
    rdan

    rdan Well-Known Member

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    That I see on
    Code:
    link rel="preconnect"
    ?
    Searching google doesn't return much info.
     
  2. Oct 8, 2019 #2
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    1.0 = 100% sure the link you want to preconnect will be called/requested. 0.5 = 50% sure etc etc
     
  3. Oct 8, 2019 #3
    rdan

    rdan Well-Known Member

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    Thanks a lot Eva!
     
  4. Oct 9, 2019 #4
    rdan

    rdan Well-Known Member

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    But rel preconnect isn't possible to configure as nginx header right?
     
  5. Oct 9, 2019 #5
    rdan

    rdan Well-Known Member

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    Or this will just work fine:
    Code:
    add_header Link <https://fonts.gstatic.com>; rel=preconnect; probability=1.0;
     
  6. Oct 9, 2019 #6
    eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    Yeah preconnect like preload hints can be added via Nginx add_header too. Just you probably don't need probability=1.0 if you 100% know the request will be made every page load and need to wrap the Link values in single or double quotes i.e.
    Code (Text):
    add_header Link '<https://fonts.gstatic.com>; rel=preconnect; crossorigin; probability=1.0;';

    or
    Code (Text):
    add_header Link '<https://fonts.gstatic.com>; rel=preconnect; crossorigin;';
     
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