- Open chrome://net-internals/#dns and press "Clear host cache"
- Open chrome://net-internals/#sockets and press "Flush socket pools"
26 нояб. 2021 г.
How to clear DNS cache in Chrome
26 мая 2021 г.
Network Filter expressions in Chrome DevTools
| Keyword | Example |
|---|---|
| cookie-domain: | cookie-domain:.google.com |
| cookie-name: | |
| cookie-path: | cookie-path:/images |
| cookie-value: | |
| domain: | domain:*.com domain:example.com |
| has-response-header: | has-response-header:Access-Control-Allow-Origin |
| is: | is:from-cache is:service-worker-intercepted |
| larger-than: | larger-than:10k |
| method: | method:POST |
| mime-type: | mime-type:application/json |
| mixed-content: | |
| priority: | priority:Highest |
| resource-type: | resource-type:image resource-type:other |
| scheme: | scheme:https |
| set-cookie-domain: | set-cookie-domain:.google.com |
| set-cookie-name: | set-cookie-name:__utma |
| set-cookie-value: | set-cookie-value:abc123 |
| status-code: | status-code:204 |
| url: | url:data: |
To invert the rule, i.e. leave URLs that do not match, prepend it with minus sign, e.g. -is:from-cache means "all resources loaded not from cache".
Any other text leaves only URLs with that text somewhere in it (in path, query, etc.)
Examples:
- larger-than:10k resource-type:image -domain:*.net
"all images not from *.net larger than 10 kilobytes" - is:from-cache resource-type:script
"cached scripts"
31 мар. 2021 г.
Performance mantra
- Don't do it
- Do it, but don't do it again
- Do it less
- Do it later
- Do it when they're not looking
- Do it concurrently
- Do it cheaper
http://www.brendangregg.com/blog/2018-06-30/benchmarking-checklist.html
19 февр. 2021 г.
Create IFRAME from string
<body>
<script>
function makeURL(str) {
var blob = new Blob([str], { type: "text/html" });
return URL.createObjectURL(blob);
}
var ifr = document.createElement("iframe");
ifr.src = makeURL('<button onclick="parent.navigate()">Click me</button>');
document.body.appendChild(ifr);
var oldTiming;
function navigate() {
oldTiming = frames[0].performance.navigation;
ifr.src = makeURL('<button onclick="parent.doReload()">Now click me</button>');
}
function doReload() {
ifr.onload = function() { alert(oldTiming.type + " " + frames[0].performance.navigation.type); }
frames[0].location.reload();
}
</script>
<script>
function makeURL(str) {
var blob = new Blob([str], { type: "text/html" });
return URL.createObjectURL(blob);
}
var ifr = document.createElement("iframe");
ifr.src = makeURL('<button onclick="parent.navigate()">Click me</button>');
document.body.appendChild(ifr);
var oldTiming;
function navigate() {
oldTiming = frames[0].performance.navigation;
ifr.src = makeURL('<button onclick="parent.doReload()">Now click me</button>');
}
function doReload() {
ifr.onload = function() { alert(oldTiming.type + " " + frames[0].performance.navigation.type); }
frames[0].location.reload();
}
</script>
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