What should I do if the vue nginx backend cannot accept parameters?

When using Vue.js and Nginx, we often encounter the problem that the backend cannot accept parameters. This usually happens when sending data to the backend server using the POST method. Sometimes, even if the request headers and data format are set correctly in the front-end code, the back-end server still cannot receive the parameters correctly.

This article will introduce the reasons why this problem occurs in Vue.js and Nginx, and provide feasible solutions.

Cause of the problem

In Vue.js, we use the axios library to send HTTP requests. For example, we can send a POST request using axios like this:

axios.post('/api/user', {
  name: 'john',
  age: 26
}, {
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded'
  }
})

In this request, we pass a JavaScript object containing the username and age as parameters to the axios.post method. We also specified the data format as application/x-www-form-urlencoded in the request header. This means we want the server to correctly parse this object and convert them into the appropriate data format.

However, if we use Nginx as a server, we usually find that it does not parse the data sent correctly. This is because Nginx does not support the application/x-www-form-urlencoded data format in POST requests by default.

Solution

To solve this problem, we need to add a directive to the Nginx configuration file. Specifically, we need to add a directive similar to the following:

location /api {
  proxy_pass http://localhost:8000;
  proxy_set_header Content-Type application/x-www-form-urlencoded;
}

In this directive, we use the location directive to set the request path to /api. We also use the proxy_pass directive to send requests to the backend server. The most critical thing is that we use the proxy_set_header directive to set the Content-Type in the request header to application/x-www-form-urlencoded. In this way, Nginx can correctly parse the POST request data sent by Vue.js.

In addition to setting the Content-Type to application/x-www-form-urlencoded, we can also set it to application/json. It depends on the data format we are sending.

Summary

When developing using Vue.js and Nginx, it is a common problem that the backend cannot accept parameters. This is because Nginx does not support the application/x-www-form-urlencoded data format in POST requests by default. To solve this problem, we need to add a directive to the Nginx configuration file to set the Content-Type in the request header to the correct data format. Hope this article can help you solve similar problems.

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