net/http.Request.URL.Host returns empty string

I was trying to redirect my client to https url. And I tried this:

func index(w http.ResponseWriter, r *http.Request) {

        if r.URL.Scheme != "https" {

                http.Redirect(w, r, "https://"+r.URL.Host+r.URL.Path, 301)

                return

        }

//....

}

But it gave me this response:

$ curl -i http://localhost

HTTP/1.1 301 Moved Permanently

Content-Type: text/html; charset=utf-8

Location: https:///

Date: Sat, 24 Nov 2018 20:02:33 GMT

Content-Length: 44



<a href="https:///">Moved Permanently</a>.

The mysterious thing is Location: https:/// this line. And I read the go doc again and found:

// URL specifies either the URI being requested (for server

// requests) or the URL to access (for client requests).

//

// For server requests the URL is parsed from the URI

// supplied on the Request-Line as stored in RequestURI.  **For

// most requests, fields other than Path and RawQuery will be

// empty. (See RFC 7230, Section 5.3)**

//

// For client requests, the URL's Host specifies the server to

// connect to, while the Request's Host field optionally

// specifies the Host header value to send in the HTTP

// request.

URL *url.URL

Then I've understood that why it's returning and empty string for r.URL.Host.

I have also tried r.Header.Get("Host") and then r.Header.Get("Origin"). It also gave me an empty string.

Any other way to get the host name?

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

1

For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 7230, Section 5.3) this line from godoc describes well that why the r.URL.Host is empty. But is there any other way to get a non empty host name?

– Anik Hasibul
Nov 24 '18 at 20:19

add a comment |

I was trying to redirect my client to https url. And I tried this:

func index(w http.ResponseWriter, r *http.Request) {

        if r.URL.Scheme != "https" {

                http.Redirect(w, r, "https://"+r.URL.Host+r.URL.Path, 301)

                return

        }

//....

}

But it gave me this response:

$ curl -i http://localhost

HTTP/1.1 301 Moved Permanently

Content-Type: text/html; charset=utf-8

Location: https:///

Date: Sat, 24 Nov 2018 20:02:33 GMT

Content-Length: 44



<a href="https:///">Moved Permanently</a>.

The mysterious thing is Location: https:/// this line. And I read the go doc again and found:

// URL specifies either the URI being requested (for server

// requests) or the URL to access (for client requests).

//

// For server requests the URL is parsed from the URI

// supplied on the Request-Line as stored in RequestURI.  **For

// most requests, fields other than Path and RawQuery will be

// empty. (See RFC 7230, Section 5.3)**

//

// For client requests, the URL's Host specifies the server to

// connect to, while the Request's Host field optionally

// specifies the Host header value to send in the HTTP

// request.

URL *url.URL

Then I've understood that why it's returning and empty string for r.URL.Host.

I have also tried r.Header.Get("Host") and then r.Header.Get("Origin"). It also gave me an empty string.

Any other way to get the host name?

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

1

For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 7230, Section 5.3) this line from godoc describes well that why the r.URL.Host is empty. But is there any other way to get a non empty host name?

– Anik Hasibul
Nov 24 '18 at 20:19

add a comment |

I was trying to redirect my client to https url. And I tried this:

func index(w http.ResponseWriter, r *http.Request) {

        if r.URL.Scheme != "https" {

                http.Redirect(w, r, "https://"+r.URL.Host+r.URL.Path, 301)

                return

        }

//....

}

But it gave me this response:

$ curl -i http://localhost

HTTP/1.1 301 Moved Permanently

Content-Type: text/html; charset=utf-8

Location: https:///

Date: Sat, 24 Nov 2018 20:02:33 GMT

Content-Length: 44



<a href="https:///">Moved Permanently</a>.

The mysterious thing is Location: https:/// this line. And I read the go doc again and found:

// URL specifies either the URI being requested (for server

// requests) or the URL to access (for client requests).

//

// For server requests the URL is parsed from the URI

// supplied on the Request-Line as stored in RequestURI.  **For

// most requests, fields other than Path and RawQuery will be

// empty. (See RFC 7230, Section 5.3)**

//

// For client requests, the URL's Host specifies the server to

// connect to, while the Request's Host field optionally

// specifies the Host header value to send in the HTTP

// request.

URL *url.URL

Then I've understood that why it's returning and empty string for r.URL.Host.

I have also tried r.Header.Get("Host") and then r.Header.Get("Origin"). It also gave me an empty string.

Any other way to get the host name?

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

I was trying to redirect my client to https url. And I tried this:

func index(w http.ResponseWriter, r *http.Request) {

        if r.URL.Scheme != "https" {

                http.Redirect(w, r, "https://"+r.URL.Host+r.URL.Path, 301)

                return

        }

//....

}

But it gave me this response:

$ curl -i http://localhost

HTTP/1.1 301 Moved Permanently

Content-Type: text/html; charset=utf-8

Location: https:///

Date: Sat, 24 Nov 2018 20:02:33 GMT

Content-Length: 44



<a href="https:///">Moved Permanently</a>.

The mysterious thing is Location: https:/// this line. And I read the go doc again and found:

// URL specifies either the URI being requested (for server

// requests) or the URL to access (for client requests).

//

// For server requests the URL is parsed from the URI

// supplied on the Request-Line as stored in RequestURI.  **For

// most requests, fields other than Path and RawQuery will be

// empty. (See RFC 7230, Section 5.3)**

//

// For client requests, the URL's Host specifies the server to

// connect to, while the Request's Host field optionally

// specifies the Host header value to send in the HTTP

// request.

URL *url.URL

Then I've understood that why it's returning and empty string for r.URL.Host.

I have also tried r.Header.Get("Host") and then r.Header.Get("Origin"). It also gave me an empty string.

Any other way to get the host name?

http url go request

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

asked Nov 24 '18 at 20:18

Anik Hasibul

121112

1

For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 7230, Section 5.3) this line from godoc describes well that why the r.URL.Host is empty. But is there any other way to get a non empty host name?

– Anik Hasibul
Nov 24 '18 at 20:19

add a comment |

1

For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 7230, Section 5.3) this line from godoc describes well that why the r.URL.Host is empty. But is there any other way to get a non empty host name?

– Anik Hasibul
Nov 24 '18 at 20:19

For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 7230, Section 5.3) this line from godoc describes well that why the r.URL.Host is empty. But is there any other way to get a non empty host name?

– Anik Hasibul
Nov 24 '18 at 20:19

add a comment |

2 Answers
2

active

oldest

votes

Try using r.Host?

The docs say:

// For server requests Host specifies the host on which the URL

// is sought. Per RFC 7230, section 5.4, this is either the value

// of the "Host" header or the host name given in the URL itself.

So Maybe try that?

func index(w http.ResponseWriter, r *http.Request) {

    if r.URL.Scheme != "https" {

            http.Redirect(w, r, "https://"+r.Host+r.URL.Path, 301)

            return

    }

//....

}

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

1

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

add a comment |

From go doc http.request:

type Request struct {

        ...

        // For incoming requests, the Host header is promoted to the

        // Request.Host field and removed from the Header map.

       ...

        Header Header

       ...

        // For server requests Host specifies the host on which the

        // URL is sought. Per RFC 2616, this is either the value of

        // the "Host" header or the host name given in the URL itself.

        ...

        Host string

Thus, use r.Host not r.Header.Get("Host")

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

Try using r.Host?

The docs say:

// For server requests Host specifies the host on which the URL

// is sought. Per RFC 7230, section 5.4, this is either the value

// of the "Host" header or the host name given in the URL itself.

So Maybe try that?

func index(w http.ResponseWriter, r *http.Request) {

    if r.URL.Scheme != "https" {

            http.Redirect(w, r, "https://"+r.Host+r.URL.Path, 301)

            return

    }

//....

}

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

1

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

add a comment |

Try using r.Host?

The docs say:

// For server requests Host specifies the host on which the URL

// is sought. Per RFC 7230, section 5.4, this is either the value

// of the "Host" header or the host name given in the URL itself.

So Maybe try that?

func index(w http.ResponseWriter, r *http.Request) {

    if r.URL.Scheme != "https" {

            http.Redirect(w, r, "https://"+r.Host+r.URL.Path, 301)

            return

    }

//....

}

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

1

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

add a comment |

Try using r.Host?

The docs say:

// For server requests Host specifies the host on which the URL

// is sought. Per RFC 7230, section 5.4, this is either the value

// of the "Host" header or the host name given in the URL itself.

So Maybe try that?

func index(w http.ResponseWriter, r *http.Request) {

    if r.URL.Scheme != "https" {

            http.Redirect(w, r, "https://"+r.Host+r.URL.Path, 301)

            return

    }

//....

}

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

Try using r.Host?

The docs say:

// For server requests Host specifies the host on which the URL

// is sought. Per RFC 7230, section 5.4, this is either the value

// of the "Host" header or the host name given in the URL itself.

So Maybe try that?

func index(w http.ResponseWriter, r *http.Request) {

    if r.URL.Scheme != "https" {

            http.Redirect(w, r, "https://"+r.Host+r.URL.Path, 301)

            return

    }

//....

}

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

answered Nov 24 '18 at 20:36

jrwren

12.3k52848

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

1

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

add a comment |

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

1

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

Thanks it worked, and accepted as answer for answering with example.

– Anik Hasibul
Nov 24 '18 at 20:42

For non-proxy requests, r.URL.Scheme is always the empty string. You can reduce the body of the handler to the http.Redirect call.

– ThunderCat
Nov 24 '18 at 22:02

add a comment |

From go doc http.request:

type Request struct {

        ...

        // For incoming requests, the Host header is promoted to the

        // Request.Host field and removed from the Header map.

       ...

        Header Header

       ...

        // For server requests Host specifies the host on which the

        // URL is sought. Per RFC 2616, this is either the value of

        // the "Host" header or the host name given in the URL itself.

        ...

        Host string

Thus, use r.Host not r.Header.Get("Host")

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

add a comment |

From go doc http.request:

type Request struct {

        ...

        // For incoming requests, the Host header is promoted to the

        // Request.Host field and removed from the Header map.

       ...

        Header Header

       ...

        // For server requests Host specifies the host on which the

        // URL is sought. Per RFC 2616, this is either the value of

        // the "Host" header or the host name given in the URL itself.

        ...

        Host string

Thus, use r.Host not r.Header.Get("Host")

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

add a comment |

From go doc http.request:

type Request struct {

        ...

        // For incoming requests, the Host header is promoted to the

        // Request.Host field and removed from the Header map.

       ...

        Header Header

       ...

        // For server requests Host specifies the host on which the

        // URL is sought. Per RFC 2616, this is either the value of

        // the "Host" header or the host name given in the URL itself.

        ...

        Host string

Thus, use r.Host not r.Header.Get("Host")

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

From go doc http.request:

type Request struct {

        ...

        // For incoming requests, the Host header is promoted to the

        // Request.Host field and removed from the Header map.

       ...

        Header Header

       ...

        // For server requests Host specifies the host on which the

        // URL is sought. Per RFC 2616, this is either the value of

        // the "Host" header or the host name given in the URL itself.

        ...

        Host string

Thus, use r.Host not r.Header.Get("Host")

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

answered Nov 24 '18 at 20:37

Steffen Ullrich

61.3k35899

add a comment |

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