How to Properly Send POST Request Data in Go?

HTTP POST Request Implementation in Go

For those attempting to send POST requests in Go, an issue often encountered is the inability to receive data on the receiving end. This guide explores the proper way to execute POST requests by addressing a common pitfall.

Understanding POST Requests

POST requests differ from GET requests in that they include additional information (payload) in their body. This payload typically consists of form data encoded in a format such as URL-encoded or multipart.

Common Mistake

A frequent mistake made when sending POST requests is assigning the form data to the PostForm field of the request object. While this approach may seem intuitive, it does not correctly send the data in the request body.

Correctly Sending POST Data

To rectify this issue, the form data should instead be included in the request body. This can be achieved using the following steps:

1. Create a new request object with http.NewRequest(method, url, body).
2. Set the request method to "POST" and provide the target URL.
3. Use strings.NewReader(form.Encode()) to create a string reader containing the encoded form data.
4. Assign the string reader to the request body.

Here's an updated code example:

req, err := http.NewRequest("POST", url, strings.NewReader(form.Encode()))

By following these steps, form data will be correctly transmitted in the request body, allowing the receiving end to process the information as intended.

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