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The Lat-Modified is a response header that contains the date and time that the resource identified by the source server was modified. It is often used as a validator to determine whether received or stored resources are consistent with each other. This is a fallback mechanism since it is less accurate than ETag. Conditional requests containing If-Modified-Since or If-Unmodified-Since headers will use this field

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Compress text (HTML/CSS/JS)

No compression for non-text (jpg/gif/png)

Compression ratio about 50% - 70%

Nginx configuration: nginx.conf file adds gzip on

Apache configuration: AddOutputFilterByType and AddOutputFilter

Response header Check whether there is Content-Encoding: gzip, which means gzip is turned on on the server.

GoGetSSL

SSLs.com

SSLmate.com

Local HomeBrew installation: brew install mkcert

Install the root certificate locally: $ mkcert --install

Generate signature locally: $mkcert 123.com //Generate certificate for 123.com

Local nginx configuration

$ cd nginx-xxx

$ ./configure --with-http_ssl_module --with-http_v2_module

$ make && make install

Check in the browser to see if there is a little green lock

Supports HTTP/2. HTTP/2 supports concurrency on a single TCP connection by using multiplexing technology to send or receive data by sending multiple requests at once on a single connection.

If HTTP/2 is not available, connection pool reuse technology can also greatly reduce latency

Supports GZIP to compress download size

Corresponding caching can completely avoid repeated network requests

If the server is configured with multiple IP addresses, when the first IP connection fails, OkHttp will automatically try the next IP

When the app starts, it caches all domain names and IPs that may be used and processes them asynchronously. The client does not need to get the cached results.

If there is a cache for this domain name in the Cache, the cached IP will be returned directly.

If this domain name is not in the cache, apply again to the HTTPDNS SERVER, and the result will be returned in this callback.

User access: Java, PHP and other API interfaces

Pages and styles: HTML/CSS/JS

Pictures: jpg, png, gif, etc.

HTML: 3 minutes

JS, CSS: 10 minutes, 1 day, 30 days

At your fingertips: users can open the app by scanning or searching

Use it and go: don’t worry about installing too many apps

H5 has a lower development threshold than App development

Better than H5, close to Native experience

Rich native capabilities such as camera, location, network, storage, etc.

The top drop-down, search, QR code and other entrances are easy to use and go away after use, which is simple and convenient.

No need to download like an app, just open and exit directly, support hot update

App platform side

Enterprise application side

First released: January 2017 (WeChat mini program)

Github Starts: Closed Source

Community active: OK

Components: very rich

Learning curve: very low

Native performance: OK

Comprehensive suggestions: platform products now have traffic output to merchants; multiple apps enable business interoperability; compared with RN and Flutter, small programs are more recommended

A handy toolkit for a beautiful building experience that lets you draw pixels anywhere on the screen

Write once and deploy to each terminal: Web, Android/iOS, Mac/Linux/Windows, Fuchsia OS

The bottom layer uses the Skia graphics engine, and the graphics performance is comparable to native applications.

Interface like a full screen app or 2D game

Fast, uses native ARM binaries, compiles ahead of time, no JVM required

May 2017

Github Starts: 8.16w (end of 2019)

The community is generally active

Components are specialized widgets and are not rich enough

The learning curve is relatively high, getting familiar with the Dart language again

Native performs best

Comprehensive suggestions: Considering performance, the business is multi-terminal oriented, and the App team has enough people, it is recommended to choose