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This article focuses on "how to use nodejs's http module to create a simple static resource server", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to create a simple static resource server with nodejs's http module.

Since the advent of nodejs, web development frameworks based on nodejs have emerged one after another, such as express and koa of TJ, thinkjs of Li Chengyin, the great god of egg,360, and so on.

These frameworks are based on nodejs core module http module encapsulation, but according to different business, different personal code style, resulting in different frameworks, today we will use nodejs's http module to package a simple http static server.

Before we start writing code, we first need to understand the model of http, which is based on the process of request = "process =" response.

Nodejs abstracts the process of sending a request from the client to the server into an event. Let's demonstrate it in code first:

At this point, run the file with the node command, you can return hello world, and the server is started.

However, this server returns hello world for any request. The function is too simple. We combine another core module of nodejs, the fs module, and convert it into a static resource server. The code is as follows:

At this point, we have initially completed the function of the static resource server. We create a new index.html under the www directory, and then test access to the following servers:

The results of the visit are as follows:

Why is this the case? Let's look at the response head:

We are not given the correct mime response header here. What should we do?

In this case, we need to use a third-party package, mime. This package has two methods: one is to obtain the mime type of the request file based on the suffix of url, and the other is to judge the file suffix based on the mime type. Obviously, we need the first. The official document demonstration code is as follows:

The server code is changed as follows:

Looking at the above code, we introduced the mime module to get the mime type of the file, and then added an additional judgment on how to append the encoding format to utf8 if the mime type contains text, which forces the browser to parse the text data according to the utf8 pattern and prevent the browser from parsing the text according to the default encoding format.

Run the server at this time and view the results:

Check the response header of network:

Check the contents in the red box and the response header has been set.

There is a color egg in the above code. I wonder if you have noticed that the res.writeheader method can not only set the response header of the http specification, but also set a custom response header. In the picture above, the editor sets a response header of clm1100.

This time it seems to be done again, but think about it, if the static file is very large, I put an avi video on www, will the above code still work properly? this will make the size of the avi, if the size of the avi exceeds the server memory, well, the server is down.

How to solve it? Another thing in nodejs, stream, stream is used here. Look at the code:

When we look at the above code, we find that instead of using the readFile method of fs, we instead use the fs.createReadStream method to convert the file into a stream, and then connect the stream to res with pipe, and then output it directly to the client. Here, the way to read the file is to read a response block, not an one-time read. About the use of stream, we will discuss it in the next article.

At this point, I believe you have a deeper understanding of "how to use nodejs's http module to create a simple static resource server". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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