golang close httpclient
In the Go language, http Client is a very commonly used network request library. During network requests, in order to optimize performance and release resources, we often need to close the http Client in time after the request is completed. So, how to close http Client in Go language? This article will introduce how to close http Client and some precautions.
Method to close Http Client
In Go language, closing http Client is achieved by calling the Close method of http Client. The Close method of http Client will release all connections, including unclosed connections. Generally speaking, we should call the http Client's Close method promptly after the request is completed to release resources.
The sample code is as follows:
package main import ( "fmt" "net/http" ) func main() { client := http.Client{} req, _ := http.NewRequest("GET", "http://www.example.com", nil) resp, err := client.Do(req) if err != nil { fmt.Println("Error:", err) } defer resp.Body.Close() defer client.Close() fmt.Println(resp.Body) }
In the above sample code, we use http Client to send a GET request, and call the Close method of http Client after the request is completed.
Notes
When using http Client, we need to pay attention to the following points:
- Reuse http Client: In some cases, we need to reuse http Client, this can avoid creating a new http Client for each request. We can pass in a reused http.Client when calling the Do method.
package main import ( "fmt" "net/http" ) func main() { transport := http.DefaultTransport.(*http.Transport).Clone() client := http.Client{Transport: transport} req1, _ := http.NewRequest("GET", "http://www.example.com", nil) resp1, err := client.Do(req1) if err != nil { fmt.Println("Error:", err) } req2, _ := http.NewRequest("GET", "http://www.example.com", nil) resp2, err := client.Do(req2) if err != nil { fmt.Println("Error:", err) } defer resp1.Body.Close() defer resp2.Body.Close() fmt.Println(resp1.Body) fmt.Println(resp2.Body) }
In the above sample code, we first copied the http.DefaultTransport and then created a new http Client. Then we sent two GET requests respectively and read the Body from the response respectively.
- Concurrent requests: When making concurrent requests, we also need to pay attention to the use of http Client. If multiple requests are sent at the same time, it is unwise to create a new http Client for each request. This will lead to a waste of system resources and possible deadlocks. Therefore, we should reuse the existing http Client.
package main import ( "fmt" "net/http" ) func main() { client := &http.Client{} respChan := make(chan *http.Response) get := func(url string) { req, _ := http.NewRequest("GET", url, nil) resp, _ := client.Do(req) defer resp.Body.Close() respChan <- resp } urls := []string{"http://www.example.com", "http://www.example.org", "http://www.example.net"} for _, url := range urls { go get(url) } for range urls { resp := <-respChan fmt.Println(resp.Body) } client.Close() }
In the above sample code, we sent three GET requests concurrently. We use a respChan channel to receive the response for each request. In the loop, we read each response from the respChan channel and output the response's Body.
Conclusion
It is very important to close the http Client. If it is not closed in time, it will cause a waste of system resources and may even cause serious problems. When using http Client, we need to pay attention to some issues such as concurrent requests and reusing http Client to optimize performance and release resources. In Go language, to close the http Client, you only need to call the Close method.
The above is the detailed content of golang close httpclient. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Go language performs well in building efficient and scalable systems. Its advantages include: 1. High performance: compiled into machine code, fast running speed; 2. Concurrent programming: simplify multitasking through goroutines and channels; 3. Simplicity: concise syntax, reducing learning and maintenance costs; 4. Cross-platform: supports cross-platform compilation, easy deployment.

Golang is better than Python in terms of performance and scalability. 1) Golang's compilation-type characteristics and efficient concurrency model make it perform well in high concurrency scenarios. 2) Python, as an interpreted language, executes slowly, but can optimize performance through tools such as Cython.

Golang is better than C in concurrency, while C is better than Golang in raw speed. 1) Golang achieves efficient concurrency through goroutine and channel, which is suitable for handling a large number of concurrent tasks. 2)C Through compiler optimization and standard library, it provides high performance close to hardware, suitable for applications that require extreme optimization.

Goimpactsdevelopmentpositivelythroughspeed,efficiency,andsimplicity.1)Speed:Gocompilesquicklyandrunsefficiently,idealforlargeprojects.2)Efficiency:Itscomprehensivestandardlibraryreducesexternaldependencies,enhancingdevelopmentefficiency.3)Simplicity:

Golang and Python each have their own advantages: Golang is suitable for high performance and concurrent programming, while Python is suitable for data science and web development. Golang is known for its concurrency model and efficient performance, while Python is known for its concise syntax and rich library ecosystem.

The performance differences between Golang and C are mainly reflected in memory management, compilation optimization and runtime efficiency. 1) Golang's garbage collection mechanism is convenient but may affect performance, 2) C's manual memory management and compiler optimization are more efficient in recursive computing.

Golang is suitable for rapid development and concurrent scenarios, and C is suitable for scenarios where extreme performance and low-level control are required. 1) Golang improves performance through garbage collection and concurrency mechanisms, and is suitable for high-concurrency Web service development. 2) C achieves the ultimate performance through manual memory management and compiler optimization, and is suitable for embedded system development.

Golang and C each have their own advantages in performance competitions: 1) Golang is suitable for high concurrency and rapid development, and 2) C provides higher performance and fine-grained control. The selection should be based on project requirements and team technology stack.
