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Definition of Lua HTTP

It is an application-level protocol used to load and fetches the World Wide Web application link on the browser Lua programming language.

It is a hypertext transfer text protocol used for transfer information on the internet using Lua technology.

It is a generic protocol to provide high-level communication between server and client of the web browser using Lua source code.

It is a stateless protocol for flexible data transportation, retrieving HTTP data, and throwing the Error of the Lua code.

It is useful for the webserver for the request to the webserver and response to the web browser.

Syntax:

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It has many modules and methods to communicate with clients and servers.

Some modules information with explanations is below.

The syntaxes are below.

The client-side request syntax is below.

new_from_uri("uri link")

The new_from_uri is fetching the given link immediately and working the procedure.

The server-side syntax is below.

The header syntax is below.

headers:append(name, value, never_index) headers:each() : status

The headers: append used to create and associate the header name, value, and Boolean authorization.

The headers: each() is useful for iteration of the header value.

The header “: status” for keep value in string format.

The util syntax is below.

The compact socket syntax is below.

This is to supply the compatibility of the request.

How HTTP works in Lua?

Step 1: Lua programming IDE Environmental Setup.

The Lua text editor, Lua compiler, and Lua interpreter installed in your virtual machine as per the version of Lua software.

Step 2: The environmental setup.

Install helping with the package manager of Lua modules (luarocks).

This manager is automatically installing dependencies.

The following command is just entered in the Lua software.

Step 3: The following dependencies you should install in the Lua software.

The basic dependencies are luaossl, basexx, lpeg, lpeg_pattern, binary heap, fifp, and queues(Microsoft windows does not support).

The document compression dependencies are lzlib and Lua-zlib.

The cookies dependency is lua-psl.

The testing dependencies are luacheck, busted, and luacov.

Step 4: Create a variable with the request.

Step 5: Create a variable with Lua new_from_uri(” uri name “).

Step 6: The headers and steam uses in the Lua HTTP.

for lua_field, lua_value in headers:each() do print(lua_field, lua_value) end

Step 7: Return the required data.

Combine the working procedure.

for lua_field, lua_value in headers:each() do print (lua_field, lua_value) end Examples

Let us discuss the examples.

Example #1: Client-side server example.

Code:

for lua_field, lua_value in headers:each() do print (lua_field, lua_value) end

Output 2: Enter the $ lua chúng tôi command in Lua command prompt.

Example #2: Client-side server with “if” loop example.

Code:

if headers : get ":status" ~= "200" then end

Output:

Output 1: Enter the $ cat chúng tôi command in Lua command prompt.

Output 2: Enter the $ lua chúng tôi command in Lua command prompt.

Example #3: Server-side example.

Code:

host: "localhost"; port: 8005; onstream: function(sa, sb) local reqst_header = sb:get_headers(), local reqst_method = sb:get(":method") local lua_path = reqst_header:get(":path") or "", local recv_path = headers.new() recv_path:append(":status", "200") recv_path:append("content-type", "text/plain") sb:write_headers(recv_path, reqst_method == "HEAD") if reqst_method ~= "HEAD" then sb:write_chunk(("Received message n":format(lua_path), true) end end }

Output 1: This output shows the port of the server.

Output 2: This output shows the message of the server.

Example #4: Util example.

Part 1: use the query-args(string) with chúng tôi example.

do print("names, values") end

Output:

Part 2: use the query-args(string) with chúng tôi example.

Output:

Example #5: Socket example.

Code:

print(dc, #bd);

Output:

Conclusion

It has many ways to control the server and client-side data or information.

It is making the Lua application easy, interactive, and protected on the server or internet.

It is helped the client to get the server-side information easily with protection.