Merge pull request #10 from Akimon658/fix-status-codes

fix: Return same status code as the requested URL

README.md

@@ -43,11 +43,6 @@ To avoid it, you can use `user-agent` flag.
 ogjson -user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36"
 ```
 
-```
-$ curl "http://localhost:8080/?url=https://docs.github.com"
-{"Policy":{"TrustedTags":["meta","link","title"]},"Title":"GitHub.com Help Documentation","Type":"article","URL":{"Source":"https://docs.github.com","Scheme":"https","Opaque":"","User":null,"Host":"docs.github.com","Path":"","RawPath":"","ForceQuery":false,"RawQuery":"","Fragment":"","RawFragment":"","Value":"http://ghdocs-prod.azurewebsites.net:80/en"},"SiteName":"GitHub Docs","Image":[{"URL":"https://github.githubassets.com/images/modules/open_graph/github-logo.png","SURL":"","Type":"","Width":0,"Height":0,"Alt":""}],"Video":[],"Audio":[],"Description":"Get started, troubleshoot, and make the most of GitHub. Documentation for new users, developers, administrators, and all of GitHub's products.","Determiner":"","Locale":"","LocaleAlt":[],"Favicon":"/assets/cb-803/images/site/favicon.svg"}
-```
-
 ## License
 [MIT](./LICENSE)
 

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"flag"
+	"fmt"
 	"log"
 	"net/http"
 	"strings"
@@ -40,10 +41,16 @@ func main() {
 			return &serverError{http.StatusInternalServerError, err.Error()}
 		}
 
+		if resp.StatusCode >= http.StatusBadRequest {
+			return &serverError{resp.StatusCode, fmt.Sprintf("error response from %s: %s", url, resp.Status)}
+		}
+
 		if !strings.HasPrefix(resp.Header.Get("Content-Type"), "text/html") {
 			return &serverError{http.StatusNotFound, `Content type of requested URL is not "text/html"`}
 		}
 
+		w.WriteHeader(resp.StatusCode)
+
 		og := opengraph.New(url)
 		if err = og.Parse(resp.Body); err != nil {
 			return &serverError{http.StatusInternalServerError, err.Error()}