How Can I Perform Dynamic Type Casting in Go with Unknown Types?

HTTP log middleware in Go can record request methods, paths, client IP and time-consuming. 1. Use http.HandlerFunc to wrap the processor, 2. Record the start time and end time before and after calling next.ServeHTTP, 3. Get the real client IP through r.RemoteAddr and X-Forwarded-For headers, 4. Use log.Printf to output request logs, 5. Apply the middleware to ServeMux to implement global logging. The complete sample code has been verified to run and is suitable for starting a small and medium-sized project. The extension suggestions include capturing status codes, supporting JSON logs and request ID tracking.

Goprovidesbuilt-insupportforhandlingenvironmentvariablesviatheospackage,enablingdeveloperstoread,set,andmanageenvironmentdatasecurelyandefficiently.Toreadavariable,useos.Getenv("KEY"),whichreturnsanemptystringifthekeyisnotset,orcombineos.Lo

Run the child process using the os/exec package, create the command through exec.Command but not execute it immediately; 2. Run the command with .Output() and catch stdout. If the exit code is non-zero, return exec.ExitError; 3. Use .Start() to start the process without blocking, combine with .StdoutPipe() to stream output in real time; 4. Enter data into the process through .StdinPipe(), and after writing, you need to close the pipeline and call .Wait() to wait for the end; 5. Exec.ExitError must be processed to get the exit code and stderr of the failed command to avoid zombie processes.

gorun is a command for quickly compiling and executing Go programs. 1. It completes compilation and running in one step, generates temporary executable files and deletes them after the program is finished; 2. It is suitable for independent programs containing main functions, which are easy to develop and test; 3. It supports multi-file operation, and can be executed through gorun*.go or lists all files; 4. It automatically processes dependencies and uses the module system to parse external packages; 5. It is not suitable for libraries or packages, and does not generate persistent binary files. Therefore, it is suitable for rapid testing during scripts, learning and frequent modifications. It is an efficient and concise way of running.

FornewGo1.21 projects,useslogforofficialstructuredloggingsupport;2.Forhigh-performanceproductionservices,chooseZaporZerologduetotheirspeedandlowallocations;3.ForeaseofuseandrichintegrationslikeSlackorSentryhooks,Logrusisidealdespitelowerperformance;4

Forhigh-performancemicroserviceswithlowlatencyandhighload,chooseFiber;2.ForstandardRESTAPIs,internaltools,orMVPs,chooseGinorEcho;3.Formaximummiddlewarecompatibility,chooseGinorEcho;4.ForExpress.js-likesyntaxandamodernfeel,chooseFiber;5.Forlong-termpr

To connect to SQL databases in Go, you need to use the database/sql package and a specific database driver. 1. Import database/sql packages and drivers (such as github.com/go-sql-driver/mysql), note that underscores before the drivers indicate that they are only used for initialization; 2. Use sql.Open("mysql","user:password@tcp(localhost:3306)/dbname") to create a database handle, and call db.Ping() to verify the connection; 3. Use db.Query() to execute query, and db.Exec() to execute

UseURLpathversioninglike/api/v1forclear,routable,anddeveloper-friendlyversioning.2.Applysemanticversioningwithmajorversions(v1,v2)only,avoidingmicro-versionslikev1.1topreventroutingcomplexity.3.OptionallysupportcontentnegotiationviaAcceptheadersifalr