How to use cURL to send Cookies?

This worked for me:

curl -v --cookie "USER_TOKEN=Yes" http://127.0.0.1:5000/

I could see the value in backend using

print(request.cookies)

You can refer to https://curl.haxx.se/docs/http-cookies.html for a complete tutorial of how to work with cookies. You can use

curl -c /path/to/cookiefile http://yourhost/

to write to a cookie file and start engine and to use cookie you can use

curl -b /path/to/cookiefile  http://yourhost/

to read cookies from and start the cookie engine, or if it isn't a file it will pass on the given string.

You are using a wrong format in your cookie file. As curl documentation states, it uses an old Netscape cookie file format, which is different from the format used by web browsers. If you need to create a curl cookie file manually, this post should help you. In your example the file should contain following line

127.0.0.1   FALSE   /   FALSE   0   USER_TOKEN  in

having 7 TAB-separated fields meaning domain, tailmatch, path, secure, expires, name, value.

curl -H @<header_file> <host>

Since curl 7.55 headers from file are supported with @<file>

echo 'Cookie: USER_TOKEN=Yes' > /tmp/cookie

curl -H @/tmp/cookie <host>

docs & commit

If you have made that request in your application already, and see it logged in Google Dev Tools, you can use the copy cURL command from the context menu when right-clicking on the request in the network tab. Copy -> Copy as cURL. It will contain all headers, cookies, etc..

I'm using Debian, and I was unable to use tilde for the path. Originally I was using

curl -c "~/cookie" http://localhost:5000/login -d username=myname password=mypassword

I had to change this to:

curl -c "/tmp/cookie" http://localhost:5000/login -d username=myname password=mypassword

-c creates the cookie, -b uses the cookie

so then I'd use for instance:

curl -b "/tmp/cookie" http://localhost:5000/getData

Another solution using json.

CURL:

curl -c /tmp/cookie -X POST -d '{"chave":"email","valor":"hvescovi@hotmail.com"}' -H "Content-Type:application/json" localhost:5000/set

curl -b "/tmp/cookie" -d '{"chave":"email"}' -X GET -H "Content-Type:application/json"  localhost:5000/get

curl -b "/tmp/cookie" -d '{"chave":"email"}' -X GET -H "Content-Type:application/json" localhost:5000/delete

PYTHON CODE:

from flask import Flask, request, session, jsonify
from flask_session import Session

app = Flask(__name__)

app.secret_key = '$#EWFGHJUI*&DEGBHYJU&Y%T#RYJHG%##RU&U'
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)

@app.route('/')
def padrao():
    return 'backend server-side.'
    
@app.route('/set', methods=['POST'])
def set():
    resposta = jsonify({"resultado": "ok", "detalhes": "ok"})
    dados = request.get_json()  
    try:  
        if 'chave' not in dados: # não tem o atributo chave?
            resposta = jsonify({"resultado": "erro", 
                            "detalhes": "Atributo chave não encontrado"})
        else:
            session[dados['chave']] = dados['valor']
    except Exception as e:  # em caso de erro...
        resposta = jsonify({"resultado": "erro", "detalhes": str(e)})

    resposta.headers.add("Access-Control-Allow-Origin", "*")
    return resposta  

@app.route('/get')
def get():
    try:
        dados = request.get_json()  
        retorno = {'resultado': 'ok'}
        retorno.update({'detalhes': session[dados['chave']]}) 
        resposta = jsonify(retorno)
    except Exception as e:  
        resposta = jsonify({"resultado": "erro", "detalhes": str(e)})
    
    resposta.headers.add("Access-Control-Allow-Origin", "*")
    return resposta 

@app.route('/delete')
def delete():
    try:
        dados = request.get_json()  
        session.pop(dados['chave'], default=None)
        resposta = jsonify({"resultado": "ok", "detalhes": "ok"})        
    except Exception as e:  # em caso de erro...
        resposta = jsonify({"resultado": "erro", "detalhes": str(e)})
            
    resposta.headers.add("Access-Control-Allow-Origin", "*")
    return resposta  

app.run(debug=True)

I am using GitBash on Windows and nothing I found worked for me.

So I settled with saving my cookie to a file named .session and used cat to read from it like so:

curl -b $(cat .session) http://httpbin.org/cookies

And if you are curious my cookie looks like this:

session=abc123