I'm using net/http package and i would like to set dynamic values to an POST url:
http://myhost.com/v1/sellers/{id}/whatever
How can i set id values in this path parameter?
You can use path.Join to build the url. You may also need to pathEscape the path-params received externally so that they can be safely placed within the path.
url1 := path.Join("http://myhost.com/v1/sellers", url.PathEscape(id), "whatever")
req, err := http.NewRequest(http.MethodPost, url1, body)
if err != nil {
return err
}
If you are trying to add params to a URL before you make a server request you can do something like this.
const (
sellersURL = "http://myhost.com/v1/sellers"
)
q := url.Values{}
q.Add("id", "1")
req, err := http.NewRequest("POST", sellersURL, strings.NewReader(q.Encode()))
if err != nil {
return err
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Close = true
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
Related
I'm trying to use a custom DialTLS Function in the http.Transport whilst using a HTTP proxy at the same time.
This is what I tried so far but whenever I configure the HTTP proxy it doesn't use the custom DialTLS Function :
tr, err := NewTransport("771,4865-4866-4867-49196-49195-49188-49187-49162-49161-52393-49200-49199-49192-49191-49172-49171-52392-157-156-61-60-53-47-49160-49170-10,65281-0-23-13-5-18-16-11-51-45-43-10-21,29-23-24-25,0")
if err != nil {
print(err)
}
tr.Proxy = http.ProxyURL(proxyURL)
tr.DisableKeepAlives = true
httpclient := &http.Client{Transport: tr, Timeout: 2 * time.Second}
proxyURL, err := url.Parse(fmt.Sprintf("http://%s", "127.0.0.1:80"))
if err != nil {
return errors.New("invalid proxy")
}
I have looked into the docs for the http.Transport and I found nothing that can help. Incase this is also required this is the custom DialTLS function I'm using:
dialtls := func(network, addr string) (net.Conn, error) {
dialConn, err := net.Dial(network, addr)
if err != nil {
return nil, err
}
config.ServerName = strings.Split(addr, ":")[0]
uTLSConn := tls.UClient(dialConn, config, tls.HelloCustom)
if err := uTLSConn.ApplyPreset(spec); err != nil {
return nil, err
}
if err := uTLSConn.Handshake(); err != nil {
return nil, err
}
return uTLSConn, nil
}
I'm trying to change the ja3 fingerprint a.k.a tls config. If anyone knows how I could achieve this please let me know
I am writing an API whichs has to redirect incoming requests to another service, the response must be forwarded to the original requester.
I figured a simple function like below should do the trick, but I was wrong.
I receive the data from my redirected response, however when I send it back to the initial request I receive this response without any data Could not get response. Error: socket hang up
If I try to execute the very same request using postman straight to the redirect URL it works perfectly fine.
func initialAssetsHandler(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return
}
resp, err := http.Post(conf.redirectURL, "application/json", bytes.NewReader(body))
if err != nil {
log.Error(err)
}
defer resp.Body.Close()
buf := new(bytes.Buffer)
buf.ReadFrom(resp.Body)
log.Info(string(buf.Bytes()))
var data json.RawMessage
if err = json.NewDecoder(resp.Body).Decode(&data); err != nil {
fmt.Println(err)
return
}
helper.SendJsonRaw(w, 200, data)
}
Here is the SendJsonRaw function:
func SendJsonRaw(w http.ResponseWriter, status int, r json.RawMessage) error {
w.Header().Set(HeaderContentType, MimeApplicationJSON)
w.WriteHeader(status)
_, err := w.Write(r)
return err
}
The r.Body is read by the json decoder up to EOF, then when you pass it to the redirect request it looks empty to the http.Client and therefore it sends no body. You need to retain the content of the body.
For example you can do the following:
func initialAssetsHandler(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return
}
var initialAssets TagAssets
if err := json.Unmarshal(&initialAssets, body); err != nil {
if !strings.Contains(err.Error(), "json: invalid use of ,string struct tag, trying to unmarshal") {
helper.SendJsonError(w, http.StatusBadRequest, err)
return
}
}
resp, err := http.Post(conf.redirectURL, "application/json", bytes.NewReader(body))
if err != nil {
log.Error(err)
}
defer resp.Body.Close()
log.Info(resp)
var data json.RawMessage
if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
fmt.Println(err)
return
}
helper.SendJsonOk(w, data)
}
Basically, I need to implement the following method in Go - https://api.slack.com/methods/users.lookupByEmail.
I tried doing it like this:
import (
"bytes"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
)
type Payload struct {
Email string `json:"email,omitempty"`
}
// assume the following code is inside some function
client := &http.Client{}
payload := Payload{
Email: "octocat#github.com",
}
body, err := json.Marshal(payload)
if err != nil {
return "", err
}
req, err := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", bytes.NewReader(body))
if err != nil {
return "", err
}
req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
t, _ := ioutil.ReadAll(resp.Body)
return "", errors.New(string(t))
}
responseData, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(responseData), nil
But I get an error that "email" field is missing, which is obvious because this content-type does not support JSON payload:
{"ok":false,"error":"invalid_arguments","response_metadata":{"messages":["[ERROR] missing required field: email"]}} (type: string)
I couldn't find how to include a post form with the GET request - there is no available post form argument neither to http.NewRequest, nor to http.Client.Get; http.Client.PostForm issues a POST request but GET is needed in this case. Also, I think I have to use http.NewRequest here (unless another approach exists) because I need to set the Authorization header.
You misunderstand the application/x-www-form-urlencoded header, you should pass an URL parameters here. Check out an example:
import (
...
"net/url"
...
)
data := url.Values{}
data.Set("email", "foo#bar.com")
data.Set("token", "SOME_TOKEN_GOES_HERE")
r, _ := http.NewRequest("GET", "https://slack.com/api/users.lookupByEmail", strings.NewReader(data.Encode()))
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))
I am writing a wrapper for an API in go. The api uses basic auth and then POST request requires PostForm value. I'm doing something like this:
func NewFoo(name string) string {
client := &http.Client{}
URL := HOST + "foo/"
req, err := http.NewRequest("POST", URL, nil)
v := url.Values{}
v.Set("name", name)
req.Form = v
req.SetBasicAuth(EMAIL, PASSWORD)
resp, err := client.Do(req)
if err != nil {
log.Fatal(err)
}
bodyText, err := ioutil.ReadAll(resp.Body)
s := string(bodyText)
return s
}
I had a similar, GET request without the form value and it works. When I run it, it tells me that the "name" value is required. (so it's not getting it)
Is there any reason this does not work?
From http://golang.org/pkg/net/http/#Request
// Form contains the parsed form data, including both the URL
// field's query parameters and the POST or PUT form data.
// This field is only available after ParseForm is called.
// The HTTP client ignores Form and uses Body instead.
Form url.Values
You have to pass your url.Values to the request's body instead.
func NewFoo(name string) string {
client := &http.Client{}
URL := HOST + "foo/"
v := url.Values{}
v.Set("name", name)
//pass the values to the request's body
req, err := http.NewRequest("POST", URL, strings.NewReader(v.Encode()))
req.SetBasicAuth(EMAIL, PASSWORD)
resp, err := client.Do(req)
if err != nil {
log.Fatal(err)
}
bodyText, err := ioutil.ReadAll(resp.Body)
s := string(bodyText)
return s
}
I'm doing a simple http GET in Go:
client := &http.Client{}
req, _ := http.NewRequest("GET", url, nil)
res, _ := client.Do(req)
But I can't found a way to customize the request header in the doc, thanks
The Header field of the Request is public. You may do this :
req.Header.Set("name", "value")
Pay attention that in http.Request header "Host" can not be set via Set method
req.Header.Set("Host", "domain.tld")
but can be set directly:
req.Host = "domain.tld":
req, err := http.NewRequest("GET", "http://10.0.0.1/", nil)
if err != nil {
...
}
req.Host = "domain.tld"
client := &http.Client{}
resp, err := client.Do(req)
If you want to set more than one header, this can be handy rather than writing set statements.
client := http.Client{}
req , err := http.NewRequest("GET", url, nil)
if err != nil {
//Handle Error
}
req.Header = http.Header{
"Host": {"www.host.com"},
"Content-Type": {"application/json"},
"Authorization": {"Bearer Token"},
}
res , err := client.Do(req)
if err != nil {
//Handle Error
}
Go's net/http package has many functions that deal with headers. Among them are Add, Del, Get and Set methods. The way to use Set is:
func yourHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("header_name", "header_value")
}