Golang : Intercept and compare HTTP response code example
Problem :
You want to query a website and intercept the response code. You also want to compare the response code to a built in HTTP response codes in net/http
package. How to do that?
Solution :
Use the http.Head()
function to query a website. The return codes can be compared with the ==
operator.
For example :
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
url := "https://www.socketloop.com"
response, err := http.Head(url)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if response.StatusCode != http.StatusOK { // <------- here !
fmt.Printf("%s returns non-200 status code. \n", url)
fmt.Printf("The reply : %v \n", response.StatusCode)
} else {
fmt.Println(response)
}
}
Happy coding!
References :
StatusContinue = 100 // access with http.StatusContinue
StatusSwitchingProtocols = 101
StatusOK = 200
StatusCreated = 201
StatusAccepted = 202
StatusNonAuthoritativeInfo = 203
StatusNoContent = 204
StatusResetContent = 205
StatusPartialContent = 206
StatusMultipleChoices = 300
StatusMovedPermanently = 301
StatusFound = 302
StatusSeeOther = 303
StatusNotModified = 304
StatusUseProxy = 305
StatusTemporaryRedirect = 307
StatusBadRequest = 400
StatusUnauthorized = 401
StatusPaymentRequired = 402
StatusForbidden = 403
StatusNotFound = 404
StatusMethodNotAllowed = 405
StatusNotAcceptable = 406
StatusProxyAuthRequired = 407
StatusRequestTimeout = 408
StatusConflict = 409
StatusGone = 410
StatusLengthRequired = 411
StatusPreconditionFailed = 412
StatusRequestEntityTooLarge = 413
StatusRequestURITooLong = 414
StatusUnsupportedMediaType = 415
StatusRequestedRangeNotSatisfiable = 416
StatusExpectationFailed = 417
StatusTeapot = 418
StatusInternalServerError = 500
StatusNotImplemented = 501
StatusBadGateway = 502
StatusServiceUnavailable = 503
StatusGatewayTimeout = 504
StatusHTTPVersionNotSupported = 505
https://www.socketloop.com/tutorials/golang-how-to-return-http-status-code
See also : Golang : How to return HTTP status code?
By Adam Ng
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