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How do you send an HTTP PATCH request in Go?

In HTTP, the PATCH request method is used to apply partial modifications to a resource. It is similar to the PUT request method, which is used to update an entire resource, but the difference is that the PATCH request method applies partial updates to a resource. The PATCH request method allows clients to update only the specific parts of a resource that have changed, rather than sending the entire resource to the server. This can be useful in situations where resources are large or where network bandwidth is limited. The PATCH request method is defined in RFC 5789 and is one of the HTTP methods used for CRUD (Create, Read, Update, Delete) operations.
HTTP PATCH request
To send an HTTP PATCH request in Go, you can use the net/http package provided by the standard library. Here's an example code snippet:

Example

package main

import (
	"bytes"
	"encoding/json"
	"net/http"
)

func main() {
	url := "http://example.com/api/resource/1"
	payload := map[string]string{"name": "New Name"}

	// encode payload to JSON
	jsonPayload, err := json.Marshal(payload)
	if err != nil {
		panic(err)
	}

	// create new HTTP PATCH request with JSON payload
	req, err := http.NewRequest("PATCH", url, bytes.NewBuffer(jsonPayload))
	if err != nil {
		panic(err)
	}

	// set content-type header to JSON
	req.Header.Set("Content-Type", "application/json")

	// create HTTP client and execute request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	// handle response
	// ...
}
In this example, we first define the URL of the resource we want to patch and the new data we want to apply to it. We then encode this data into JSON format and create a new HTTP PATCH request using the http.NewRequest function. We set the Content-Type header to indicate that we are sending JSON data in the request body. Finally, we create an HTTP client and execute the request using the Do method. We can then handle the response as needed.
HTTP PATCH request using GIN
To send an HTTP PATCH request in Go Gin, you can use the net/http package provided by the standard library. Here's an example code snippet:

Example

package main

import (
	"bytes"
	"encoding/json"
	"net/http"

	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()

	r.PATCH("/api/resource/:id", func(c *gin.Context) {
		id := c.Param("id")
		url := "http://example.com/api/resource/" + id

		payload := map[string]string{"name": "New Name"}

		// encode payload to JSON
		jsonPayload, err := json.Marshal(payload)
		if err != nil {
			c.AbortWithStatus(http.StatusInternalServerError)
			return
		}

		// create new HTTP PATCH request with JSON payload
		req, err := http.NewRequest("PATCH", url, bytes.NewBuffer(jsonPayload))
		if err != nil {
			c.AbortWithStatus(http.StatusInternalServerError)
			return
		}

		// set content-type header to JSON
		req.Header.Set("Content-Type", "application/json")

		// create HTTP client and execute request
		client := &http.Client{}
		resp, err := client.Do(req)
		if err != nil {
			c.AbortWithStatus(http.StatusInternalServerError)
			return
		}
		defer resp.Body.Close()

		// handle response
		// ...

		c.Status(resp.StatusCode)
	})

	r.Run(":8080")
}
In this example, we define a PATCH route using Go Gin's PATCH method. We extract the resource ID from the URL parameters and use it to construct the resource URL. We then define the new data we want to apply to the resource and encode it into JSON format. We create a new HTTP PATCH request using the http.NewRequest function, set the Content-Type header to indicate that we are sending JSON data in the request body, and execute the request using an HTTP client. We can then handle the response as needed and return the HTTP status code to the client using the c.Status method.
HTTP PATCH request using Beego

Example

package main

import (
	"fmt"
	"github.com/astaxie/beego/httplib"
)

func main() {
	url := "https://example.com/api/user/123"
	body := []byte(`{"name": "John"}`)

	req := httplib.Patch(url)
	req.Body(body)

	resp, err := req.Response()
	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	fmt.Println("Response status:", resp.Status)
}
In this example, we create an HTTP PATCH request with the URL "https://example.com/api/user/123" and a JSON body containing the updated user data. We then send the request using the Response method and print the status of the response. You can modify the URL and body to suit your specific use case.
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