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SSL Certificate Checker

March 20, 2019
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After installing the SSL certificate on the Nginx web server, you need to check if it is installed correctly.

I installed the SSL certificate two months ago. The Sectigo ECC certificate.

Now I change the certificate files.

Previously, I put the site SSL certificate file content and the SSL-bundle file altogether. The final SSL certificate file is 4.36KB. It includes three certificates. The guide is from Comodo official site. Sectigo site has a similar guide here.

Now, I remove the last one. Just keep the site certificate and the middle one. Total size is  3.01KB.

The certificate I deleted from the old file is for USERTrust ECC Certification Authority. It is already included in the Trusted Root CA list.

Then, I tested the new certificate file, which has two certificates only, on different online SSL checking tools.

 

Geocerts SSL checking Result

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Make the webpage faster

January 6, 2012
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During past few months, I feel my blog is loaded slower and slower. Especially when I compared it with the past.
At yesterday night and this morning, I did some fine tuning of my blog. To make the webpage loading faster and also make my blog reader happy.
1) Remove the Google Plus button which is previous showing on the menu.
Every single page of article has its own Google Plus button. So remove this sitewide one.
2) Add width and height of every images of the template.
The improvement is big.
I use the previous post as an example.
Before changes:
First View Load Time is 9.619s, First Byte 0.465s, Start Render 3.368s.
Now:
First View Load Time is 6.099s, First Byte 0.421s, Start Render 0.777s.

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How to use Webpagetest Free tool to test your blog load time

January 7, 2011
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To double the traffic, one of the optimization steps is to test the load time of page and find the way to speed up.
I recommend WebPagetest. It is a free tool to test your blog / web page. See how fast to load the whole page. It tests two time, one is fresh load, the other is repeat view.
I tested my home page of this blog. The result is pretty good. Page Speed Score: 97/100
Let us see how it is:
webpagetest-yinfor

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WebPageTest has new UI

August 11, 2010
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I do like to mod my Blog time by time. And also check the performance of website often.
Now, I find UI of one of the best testing sites is changed. It is WebPageTest.
The new look is clear and fast.
OK, the point is not his UI or performance. I am talking about my blog. How fast it is loaded and easy to navigate.
To optimize my blog, I implement to speed up.
0) Merge CSS files into one CSS file.
1) Use minify tool, or Yuicompressor from Yahoo,to minify CSS and JS files.
2) Use CDN, Amazon CloudFront, to serve some static files, including CSS, JS, Images.
3) Enable gzip for CSS and JS and Html.
4) Add longer expiry date for static files.
The testing result of David Yin Blog shown as blow.

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