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Proxy server to bypass Cloudflare protection

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FlareSolverr is a proxy server to bypass Cloudflare protection.

How it works

FlareSolverr starts a proxy server and it waits for user requests in an idle state using few resources. When some request arrives, it uses puppeteer with the stealth plugin to create a headless browser (Chrome). It opens the URL with user parameters and waits until the Cloudflare challenge is solved (or timeout). The HTML code and the cookies are sent back to the user, and those cookies can be used to bypass Cloudflare using other HTTP clients.

NOTE: Web browsers consume a lot of memory. If you are running FlareSolverr on a machine with few RAM, do not make many requests at once. With each request a new browser is launched.

It is also possible to use a permanent session. However, if you use sessions, you should make sure to close them as soon as you are done using them.



It is recommended to install using a Docker container because the project depends on an external browser that is already included within the image.

Docker images are available in: * GitHub Registry => * DockerHub =>

Supported architectures are: | Architecture | Tag | | :----: | --- | | x86-64 | linux/amd64 | | ARM64 | linux/arm64 | | ARM32 | linux/arm/v7 |

We provide a

configuration file. Clone this repository and execute
docker-compose up -d
to start the container.

If you prefer the

docker cli
execute the following command.
docker run -d \
  --name=flaresolverr \
  -p 8191:8191 \
  -e LOG_LEVEL=info \
  --restart unless-stopped \

Precompiled binaries

This is the recommended way for Windows users. * Download the FlareSolverr zip from the release's assets. It is available for Windows and Linux. * Extract the zip file. FlareSolverr executable and chrome folder must be in the same directory. * Execute FlareSolverr binary. In the environment variables section you can find how to change the configuration.

From source code

This is the recommended way for macOS users and for developers. * Install NodeJS. * Clone this repository and open a shell in that path. * Run

npm install
command to install FlareSolverr dependencies. * Run
node node_modules/puppeteer/install.js
to install Chromium. * Run
npm run build
command to compile TypeScript code. * Run
npm start
command to start FlareSolverr.

Systemd service

We provide an example Systemd unit file

as reference. You have to modify the file to suit your needs: paths, user and environment variables.


Example request:

curl -L -X POST 'http://localhost:8191/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
  "cmd": "request.get",
  "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleW...",
  "maxTimeout": 60000,
  "headers": {
    "X-Test": "Testing 123..."



This will launch a new browser instance which will retain cookies until you destroy it with

. This comes in handy, so you don't have to keep solving challenges over and over and you won't need to keep sending cookies for the browser to use.

This also speeds up the requests since it won't have to launch a new browser instance for every request.

Parameter | Notes |--|--| session | Optional. The session ID that you want to be assigned to the instance. If isn't set a random UUID will be assigned. userAgent | Optional. Will be used by the headless browser.


Returns a list of all the active sessions. More for debugging if you are curious to see how many sessions are running. You should always make sure to properly close each session when you are done using them as too many may slow your computer down.

Example response:

  "sessions": [


This will properly shutdown a browser instance and remove all files associated with it to free up resources for a new session. When you no longer need to use a session you should make sure to close it.

Parameter | Notes |--|--| session | The session ID that you want to be destroyed.


Parameter | Notes |--|--| url | Mandatory session | Optional. Will send the request from and existing browser instance. If one is not sent it will create a temporary instance that will be destroyed immediately after the request is completed. headers | Optional. To specify user headers. maxTimeout | Optional, default value 60000. Max timeout to solve the challenge in milliseconds. cookies | Optional. Will be used by the headless browser. Follow this format. returnOnlyCookies | Optional, default false. Only returns the cookies. Response data, headers and other parts of the response are removed. returnRawHtml | Optional, default false. The response data will be returned without JS processing. This is useful for JSON or plain text content.

Example response from running the

    "solution": {
        "url": "",
        "status": 200,
        "headers": {
            "status": "200",
            "date": "Thu, 16 Jul 2020 04:15:49 GMT",
            "expires": "-1",
            "cache-control": "private, max-age=0",
            "content-type": "text/html; charset=UTF-8",
            "strict-transport-security": "max-age=31536000",
            "p3p": "CP=\"This is not a P3P policy! See for more info.\"",
            "content-encoding": "br",
            "server": "gws",
            "content-length": "61587",
            "x-xss-protection": "0",
            "x-frame-options": "SAMEORIGIN",
            "set-cookie": "1P_JAR=2020-07-16-04; expires=Sat..."
        "cookies": [
                "name": "NID",
                "value": "204=QE3Ocq15XalczqjuDy52HeseG3zAZuJzID3R57...",
                "domain": "",
                "path": "/",
                "expires": 1610684149.307722,
                "size": 178,
                "httpOnly": true,
                "secure": true,
                "session": false,
                "sameSite": "None"
                "name": "1P_JAR",
                "value": "2020-07-16-04",
                "domain": "",
                "path": "/",
                "expires": 1597464949.307626,
                "size": 19,
                "httpOnly": false,
                "secure": true,
                "session": false,
                "sameSite": "None"
        "userAgent": "Windows NT 10.0; Win64; x64) AppleWebKit/5..."
    "status": "ok",
    "message": "",
    "startTimestamp": 1594872947467,
    "endTimestamp": 1594872949617,
    "version": "1.0.0"


This is the same as

but it takes one more param:

Parameter | Notes |--|--| postData | Must be a string. If you want to POST a form, don't forget to set the

header to
or the server might not understand your request.

Download small files

If you need to access an image/pdf or small file, you should pass the

parameter to
setting it to
. Rather than access the html and return text it will return the buffer base64 encoded which you will be able to decode and save the image/pdf.

This method isn't recommended for videos or anything larger. As that should be streamed back to the client and at the moment there is nothing setup to do so. If this is something you need feel free to create an issue and/or submit a PR.

Environment variables

Name | Default | Notes |--|--|--| LOGLEVEL | info | Verbosity of the logging. Use `LOGLEVEL=debug

for more information.
LOG_HTML | false | Only for debugging. If
all HTML that passes through the proxy will be logged to the console in
CAPTCHA_SOLVER | none | Captcha solving method. It is used when a captcha is encountered. See the Captcha Solvers section.
TZ | UTC | Timezone used in the logs and the web browser. Example:
TZ=Europe/London`. HEADLESS | true | Only for debugging. To run the web browser in headless mode or visible. PORT | 8191 | Listening port. You don't need to change this if you are running on Docker. HOST | | Listening interface. You don't need to change this if you are running on Docker.

Environment variables are set differently depending on the operating system. Some examples: * Docker: Take a look at the Docker section in this document. Environment variables can be set in the

file or in the Docker CLI command. * Linux: Run
export LOG_LEVEL=debug
and then start FlareSolverr in the same shell. * Windows: Open
, run
set LOG_LEVEL=debug
and then start FlareSolverr in the same shell.

Captcha Solvers

:warning: At this time none of the captcha solvers work. You can check the status in the open issues. Any help is welcome.

Sometimes CloudFlare not only gives mathematical computations and browser tests, sometimes they also require the user to solve a captcha. If this is the case, FlareSolverr will return the error

Captcha detected but no automatic solver is configured.

FlareSolverr can be customized to solve the captchas automatically by setting the environment variable

to the file name of one of the adapters inside the /captcha directory.


This method makes use of the hcaptcha-solver project.

NOTE: This solver works picking random images so it will fail in a lot of requests and it's hard to know if it is working or not. In a real use case with Sonarr/Radarr + Jackett it is still useful because those apps make a new request each 15 minutes. Eventually one of the requests is going to work and Jackett saves the cookie forever (until it stops working).

To use this solver you must set the environment variable:



This method makes use of the CaptchaHarvester project which allows users to collect their own tokens from ReCaptcha V2/V3 and hCaptcha for free.

To use this method you must set these environment variables:


Note: above I set

to the default configuration of the captcha harvester's server, but that could change if you customize the command line flags. Simply put,
should be set to the URI of the route that returns a token in plain text when called.

Related projects

  • C# implementation =>

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