diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 414588f..9fc8bab 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ !contains(github.event.head_commit.message, 'chore(') }}
     env:
-      EXTENSION_PATH: "my-own-modules/lapi-client"
+      EXTENSION_PATH: "my-code/lapi-client"
 
     steps:
       - name: Clone DDEV files
diff --git a/.github/workflows/unit-and-integration-test.yml b/.github/workflows/unit-and-integration-test.yml
index 61c2f6b..bcba999 100644
--- a/.github/workflows/unit-and-integration-test.yml
+++ b/.github/workflows/unit-and-integration-test.yml
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ !contains(github.event.head_commit.message, 'chore(') }}
     env:
-      EXTENSION_PATH: "my-own-modules/lapi-client"
+      EXTENSION_PATH: "my-code/lapi-client"
 
     steps:
       - name: Clone DDEV files
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5a7929..00f46c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 The [public API](https://semver.org/spec/v2.0.0.html#spec-item-1) of this library consists of all public or protected methods, properties and constants belonging to the `src` folder.
 
+---
+
+## [3.1.0](https://github.com/crowdsecurity/php-lapi-client/releases/tag/v3.1.0) - 2023-04-27
+[_Compare with previous release_](https://github.com/crowdsecurity/php-lapi-client/compare/v3.0.0...v3.1.0)
+
+### Changed
+
+
+- `api_url` configuration must not be empty
+
+
 ---
 
 ## [3.0.0](https://github.com/crowdsecurity/php-lapi-client/releases/tag/v3.0.0) - 2023-03-09
diff --git a/docs/DEVELOPER.md b/docs/DEVELOPER.md
index 46faa49..0930e33 100644
--- a/docs/DEVELOPER.md
+++ b/docs/DEVELOPER.md
@@ -50,26 +50,19 @@ For a quick start, follow the below steps.
 This project is fully compatible with DDEV 1.21.4, and it is recommended to use this specific version.
 For the DDEV installation, please follow the [official instructions](https://ddev.readthedocs.io/en/stable/users/install/ddev-installation/).
 
-
 #### Prepare DDEV PHP environment
 
 The final structure of the project will look like below.
 
 ```
-crowdsec-lapi-client-dev-project (choose the name you want for this folder)
+crowdsec-lapi-dev-project (choose the name you want for this folder)
 │       
 │
-└───.ddev (do not change this folder name)
-│   │   
-│   │ (Cloned sources of a PHP specific ddev repo)
-│    
-│   
-└─── cfssl (do not change this folder name)
+└───.ddev
 │   │   
-│   │ (Copy of some provided files for TLS authentification)  
-│
+│   │ (DDEV files)
 │   
-└───my-own-modules (do not change this folder name)
+└───my-code (do not change this folder name)
     │   
     │
     └───lapi-client (do not change this folder name)
@@ -80,50 +73,29 @@ crowdsec-lapi-client-dev-project (choose the name you want for this folder)
 
 - Create an empty folder that will contain all necessary sources:
 ```bash
-mkdir crowdsec-lapi-client-dev-project
+mkdir crowdsec-lapi-dev-project
 ```
 
-- Create a `my-own-modules/lapi-client` folder with sources of this repo:
+- Create a DDEV php project:
 
 ```bash
-cd crowdsec-lapi-client-dev-project
-mkdir -p my-own-modules/lapi-client
-cd my-own-modules/lapi-client && git clone git@github.com:crowdsecurity/php-lapi-client.git ./
+cd crowdsec-lapi-dev-project
+ddev config --project-type=php --php-version=8.2 --project-name=crowdsec-lapi-client
 ```
 
-- Create an empty `.ddev` folder for DDEV and clone our pre-configured DDEV repo:
+- Add some DDEV add-ons:
 
 ```bash
-cd crowdsec-lapi-client-dev-project
-mkdir .ddev && cd .ddev && git clone git@github.com:julienloizelet/ddev-php.git ./
+ddev get julienloizelet/ddev-tools
+ddev get julienloizelet/ddev-crowdsec-php
 ```
 
-Copy the CrowdSec related docker-compose file: 
-```bash
-cd crowdsec-lapi-client-dev-project
-cp .ddev/additional_docker_compose/docker-compose.crowdsec.yaml .ddev/docker-compose.crowdsec.yaml
-```
-
-Then, as we use a TLS ready CrowdSec container, you have to copy some certificates and key in a `cfssl` folder:
-
-```bash
-mkdir cfssl
-cp -r ../.ddev/custom_files/crowdsec/cfssl/* cfssl
-```
-
-By default, ddev will launch a PHP 7.2 container. If you want to work with another PHP version, copy the
-corresponding config file. For example:
-
-```bash
-
-cp .ddev/config_overrides/config.php74.yaml .ddev/config.php74.yaml
-```
-- Launch DDEV
+- Clone this repo sources in a `my-code/lapi-client` folder:
 
 ```bash
-cd .ddev && ddev start
+mkdir -p my-code/lapi-client
+cd my-code/lapi-client && git clone git@github.com:crowdsecurity/php-lapi-client.git ./
 ```
-This should take some times on the first launch as this will download all necessary docker images.
 
 
 ### DDEV Usage
@@ -134,13 +106,13 @@ This should take some times on the first launch as this will download all necess
 Run:
 
 ```bash
-ddev composer update --working-dir ./my-own-modules/lapi-client
+ddev composer update --working-dir ./my-code/lapi-client
 ```
 
 #### Unit test
 
 ```bash
-ddev php ./my-own-modules/lapi-client/vendor/bin/phpunit  ./my-own-modules/lapi-client/tests/Unit --testdox
+ddev php ./my-code/lapi-client/vendor/bin/phpunit  ./my-code/lapi-client/tests/Unit --testdox
 ```
 
 #### Integration test
@@ -148,7 +120,7 @@ ddev php ./my-own-modules/lapi-client/vendor/bin/phpunit  ./my-own-modules/lapi-
 In order to launch integration tests, we have to set some environment variables:
 
 ```bash
-ddev exec BOUNCER_KEY=<BOUNCER_KEY> AGENT_TLS_PATH=/var/www/html/cfssl LAPI_URL=https://crowdsec:8080 php ./my-own-modules/lapi-client/vendor/bin/phpunit  ./my-own-modules/lapi-client/tests/Integration --testdox     
+ddev exec BOUNCER_KEY=<BOUNCER_KEY> AGENT_TLS_PATH=/var/www/html/cfssl LAPI_URL=https://crowdsec:8080 php ./my-code/lapi-client/vendor/bin/phpunit  ./my-code/lapi-client/tests/Integration --testdox     
 ```
 
 `<BOUNCER_KEY>` should have been created and retrieved before this test by running `ddev create-bouncer`.
@@ -156,7 +128,7 @@ ddev exec BOUNCER_KEY=<BOUNCER_KEY> AGENT_TLS_PATH=/var/www/html/cfssl LAPI_URL=
 If you need to test with a TLS authentication, you should launch:
 
 ```bash
-ddev exec BOUNCER_TLS_PATH=/var/www/html/cfssl AGENT_TLS_PATH=/var/www/html/cfssl LAPI_URL=https://crowdsec:8080 php ./my-own-modules/lapi-client/vendor/bin/phpunit  ./my-own-modules/lapi-client/tests/Integration --testdox     
+ddev exec BOUNCER_TLS_PATH=/var/www/html/cfssl AGENT_TLS_PATH=/var/www/html/cfssl LAPI_URL=https://crowdsec:8080 php ./my-code/lapi-client/vendor/bin/phpunit  ./my-code/lapi-client/tests/Integration --testdox     
 ```
 
 #### Coding standards
@@ -165,7 +137,7 @@ We set up some coding standards tools that you will find in the `tools/coding-st
 In order to use these, you will need to work with a PHP version >= 7.4 and run first:
 
 ```bash
-ddev composer update --working-dir=./my-own-modules/lapi-client/tools/coding-standards
+ddev composer update --working-dir=./my-code/lapi-client/tools/coding-standards
 ```
 
 ##### PHPCS Fixer
@@ -176,7 +148,7 @@ With ddev, you can do the following:
 
 
 ```bash
-ddev phpcsfixer my-own-modules/lapi-client/tools/coding-standards/php-cs-fixer ../
+ddev phpcsfixer my-code/lapi-client/tools/coding-standards/php-cs-fixer ../
 
 ```
 
@@ -186,7 +158,7 @@ To use the [PHPSTAN](https://github.com/phpstan/phpstan) tool, you can run:
 
 
 ```bash
-ddev phpstan /var/www/html/my-own-modules/lapi-client/tools/coding-standards phpstan/phpstan.neon /var/www/html/my-own-modules/lapi-client/src
+ddev phpstan /var/www/html/my-code/lapi-client/tools/coding-standards phpstan/phpstan.neon /var/www/html/my-code/lapi-client/src
 
 ```
 
@@ -196,7 +168,7 @@ ddev phpstan /var/www/html/my-own-modules/lapi-client/tools/coding-standards php
 To use the [PHPMD](https://github.com/phpmd/phpmd) tool, you can run:
 
 ```bash
-ddev phpmd ./my-own-modules/lapi-client/tools/coding-standards phpmd/rulesets.xml ../../src
+ddev phpmd ./my-code/lapi-client/tools/coding-standards phpmd/rulesets.xml ../../src
 
 ```
 
@@ -205,13 +177,13 @@ ddev phpmd ./my-own-modules/lapi-client/tools/coding-standards phpmd/rulesets.xm
 To use [PHP Code Sniffer](https://github.com/squizlabs/PHP_CodeSniffer) tools, you can run:
 
 ```bash
-ddev phpcs ./my-own-modules/lapi-client/tools/coding-standards my-own-modules/lapi-client/src PSR12
+ddev phpcs ./my-code/lapi-client/tools/coding-standards my-code/lapi-client/src PSR12
 ```
 
 and:
 
 ```bash
-ddev phpcbf  ./my-own-modules/lapi-client/tools/coding-standards my-own-modules/lapi-client/src PSR12
+ddev phpcbf  ./my-code/lapi-client/tools/coding-standards my-code/lapi-client/src PSR12
 ```
 
 
@@ -220,7 +192,7 @@ ddev phpcbf  ./my-own-modules/lapi-client/tools/coding-standards my-own-modules/
 To use [PSALM](https://github.com/vimeo/psalm) tools, you can run:
 
 ```bash
-ddev psalm ./my-own-modules/lapi-client/tools/coding-standards ./my-own-modules/lapi-client/tools/coding-standards/psalm
+ddev psalm ./my-code/lapi-client/tools/coding-standards ./my-code/lapi-client/tools/coding-standards/psalm
 ```
 
 ##### PHP Unit Code coverage
@@ -235,7 +207,7 @@ ddev xdebug
 
 To generate a html report, you can run:
 ```bash
-ddev php -dxdebug.mode=coverage ./my-own-modules/lapi-client/tools/coding-standards/vendor/bin/phpunit --configuration ./my-own-modules/lapi-client/tools/coding-standards/phpunit/phpunit.xml
+ddev php -dxdebug.mode=coverage ./my-code/lapi-client/tools/coding-standards/vendor/bin/phpunit --configuration ./my-code/lapi-client/tools/coding-standards/phpunit/phpunit.xml
 ```
 
 You should find the main report file `dashboard.html` in `tools/coding-standards/phpunit/code-coverage` folder.
@@ -244,7 +216,7 @@ You should find the main report file `dashboard.html` in `tools/coding-standards
 If you want to generate a text report in the same folder:
 
 ```bash
-ddev php -dxdebug.mode=coverage ./my-own-modules/lapi-client/tools/coding-standards/vendor/bin/phpunit --configuration ./my-own-modules/lapi-client/tools/coding-standards/phpunit/phpunit.xml --coverage-text=./my-own-modules/lapi-client/tools/coding-standards/phpunit/code-coverage/report.txt
+ddev php -dxdebug.mode=coverage ./my-code/lapi-client/tools/coding-standards/vendor/bin/phpunit --configuration ./my-code/lapi-client/tools/coding-standards/phpunit/phpunit.xml --coverage-text=./my-code/lapi-client/tools/coding-standards/phpunit/code-coverage/report.txt
 ```
 
 ## Commit message
diff --git a/src/Configuration.php b/src/Configuration.php
index eef7ca4..e386563 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -86,7 +86,7 @@ public function getConfigTreeBuilder(): TreeBuilder
     private function addConnectionNodes($rootNode)
     {
         $rootNode->children()
-            ->scalarNode('api_url')->defaultValue(Constants::DEFAULT_LAPI_URL)->end()
+            ->scalarNode('api_url')->cannotBeEmpty()->defaultValue(Constants::DEFAULT_LAPI_URL)->end()
             ->enumNode('auth_type')
                 ->values(
                     [
diff --git a/src/Constants.php b/src/Constants.php
index 7dffc02..c079d13 100644
--- a/src/Constants.php
+++ b/src/Constants.php
@@ -37,5 +37,5 @@ class Constants extends CommonConstants
     /**
      * @var string The current version of this library
      */
-    public const VERSION = 'v3.0.0';
+    public const VERSION = 'v3.1.0';
 }
diff --git a/tests/Integration/BouncerTest.php b/tests/Integration/BouncerTest.php
index 4d6f4de..b994bfe 100644
--- a/tests/Integration/BouncerTest.php
+++ b/tests/Integration/BouncerTest.php
@@ -29,6 +29,15 @@ final class BouncerTest extends TestCase
      * @var array
      */
     protected $configs;
+    /**
+     * @var string
+     */
+    protected $useTls;
+    /**
+     * @var WatcherClient
+     */
+    protected $watcherClient;
+
 
     private function addTlsConfig(&$bouncerConfigs, $tlsPath)
     {
diff --git a/tests/Integration/WatcherClient.php b/tests/Integration/WatcherClient.php
index b602d33..5d1eee6 100644
--- a/tests/Integration/WatcherClient.php
+++ b/tests/Integration/WatcherClient.php
@@ -20,6 +20,10 @@ class WatcherClient extends AbstractClient
 
     /** @var string */
     private $token;
+    /**
+     * @var array|string[]
+     */
+    protected $headers = [];
 
     public function __construct(array $configs)
     {
diff --git a/tests/Unit/BouncerTest.php b/tests/Unit/BouncerTest.php
index 0904dc9..2e8b7ce 100644
--- a/tests/Unit/BouncerTest.php
+++ b/tests/Unit/BouncerTest.php
@@ -168,6 +168,20 @@ public function testConfigure()
             'user_agent_suffix length should be <16'
         );
 
+        $error = '';
+        try {
+            new Bouncer(['api_url' => '']);
+        } catch (\Exception $e) {
+            $error = $e->getMessage();
+        }
+
+        PHPUnitUtil::assertRegExp(
+            $this,
+            '/cannot contain an empty value/',
+            $error,
+            'api_url must not be empty'
+        );
+
         $error = '';
         try {
             new Bouncer(['api_key' => TestConstants::API_KEY, 'user_agent_suffix' => 'aaaaa  a']);