Update README

Signed-off-by: Jianhui Zhao <jianhuizhao329@gmail.com>

README.md

@@ -2,31 +2,74 @@
 
 ![](https://img.shields.io/badge/license-GPLV3-brightgreen.svg?style=plastic "License")
 
-A very tiny and fast HTTP library based on [libev](http://software.schmorp.de/pkg/libev.html) and 
-[http-parser](https://github.com/nodejs/http-parser) for Embedded Linux.
+[libev]: http://software.schmorp.de/pkg/libev.html
+[http-parser]: https://github.com/nodejs/http-parser
+
+A very tiny and fast HTTP library based on [libev] and [http-parser] for Embedded Linux.
 
 `Keep Watching for More Actions on This Space`
 
 # Features
-* Tiny and fast
+* use [libev] as its event backend
+* tiny and fast
 * SSL support: Optional OpenSSL and CyaSSl(wolfssl)
-* Highly customizable, and can be easily integrated into your application
+* flexible and you can easily extend your application to have HTTP/HTTPS services
 
-# How To Compile on Ubuntu
+# Why use [libev] as its backend?
+[libev] tries to do one thing only (POSIX event library), and this in the most efficient way possible.
+Libevent tries to give you the full solution (event lib, non-blocking I/O library, http server, DNS client).
+
+[libev] tries to follow the UNIX toolbox philosophy of doing one thing only, as good as possible.
+
+# Build on Ubuntu
 ## Install dependency Tools and Libraries
-	sudo apt install cmake libev-dev libhttp-parser-dev
 
-## Compile libuhttp
-	git clone https://github.com/zhaojh329/libuhttp.git
-    cd libuhttp
-    mkdir build
-    cd build
-    cmake ../
-    make && sudo make install
+	~$ sudo apt install cmake libev-dev libhttp-parser-dev libssl-dev libwolfssl-dev
 
-## Test
-	$ cd ../ && ./gen_cert.sh
-	$ ./build/example/helloworld
+## Clone the repository
+
+	~$ git clone https://github.com/zhaojh329/libuhttp.git
+	~$ cd libuhttp
+
+## Create the build directory
+
+	~/libuhttp$ mkdir build
+	~/libuhttp$ cd build
+
+## Configure
+See which configuration are supported
+
+	~/libuhttp/build$ cmake .. -LH
+
+Default configure: automatically select the SSL library as its SSL backend(If there is a SSL library available).
+
+	~/libuhttp/build$ cmake ..
+
+Disable SSl support
+
+	~/libuhttp/build$ cmake .. -DUHTTP_DISABLE_SSL=1
+
+Explicit use OpenSSL as its SSL backend
+
+	~/libuhttp/build$ cmake .. -DUHTTP_USE_OPENSSL=1
+
+Explicit use CyaSSl(wolfssl) as its SSL backend
+
+	~/libuhttp/build$ cmake .. -DUHTTP_USE_CYASSL=1
+	
+## Build and install libuhttp
+
+    ~/libuhttp/build$ make && sudo make install
+	
+## Run the Example
+First generate the SSL certificate file
+
+	~/libuhttp/build$ cd ..
+	~/libuhttp$ ./gen_cert.sh
+	
+Run
+
+	~/libuhttp$ ./build/example/helloworld
 	
 Then use the command curl or browser to access https://127.0.0.1:8000/test
 
@@ -39,7 +82,7 @@ If you would like to help making [libuhttp](https://github.com/zhaojh329/libuhtt
 see the [CONTRIBUTING.md](https://github.com/zhaojh329/libuhttp/blob/master/CONTRIBUTING.md) file.
 
 # Thanks for the following project
-* [libev](http://software.schmorp.de/pkg/libev.html)
-* [http-parser](https://github.com/nodejs/http-parser)
+* [libev]
+* [http-parser]
 
 # If the project is helpful to you, please do not hesitate to star. Thank you!

src/CMakeLists.txt

@@ -15,8 +15,8 @@ set(EXTRA_LIBS ${LIBEV_LIBRARIES} ${HTTPPARSER_LIBRARIES})
 set(SOURCE_FILES uhttp.c uhttp_log.c uhttp_buf.c uhttp_ssl.c)
 
 option(UHTTP_DISABLE_SSL "Disable ssl support" OFF)
-option(UHTTP_USE_OPENSSL "Force use OpenSSL as SSL backend" OFF)
-option(UHTTP_USE_CYASSL "Force use CyaSSL as SSL backend" OFF)
+option(UHTTP_USE_OPENSSL "Explicit use OpenSSL as SSL backend" OFF)
+option(UHTTP_USE_CYASSL "Explicit use CyaSSL as SSL backend" OFF)
 
 set(UHTTP_SSL_ENABLED OFF)
 set(UHTTP_SSL_ENABLED_CONFIG 0)