Project web hooks allow you to trigger an URL if new code is pushed or a new issue is created.

---

You can configure web hook to listen for specific events like pushes, issues, merge requests.
GitLab will send POST request with data to web hook URL.
Web Hooks can be used to update an external issue tracker, trigger CI builds, update a backup mirror, or even deploy to your production server.
If you send a web hook to an SSL endpoint [the certificate will not be verified](https://gitlab.com/gitlab-org/gitlab-ce/blob/ccd617e58ea71c42b6b073e692447d0fe3c00be6/app/models/web_hook.rb#L35) since many people use self-signed certificates.

---

#### Push events

Triggered when you push to the repository except pushing tags.

**Request body:**

```json
{
  "before": "95790bf891e76fee5e1747ab589903a6a1f80f22",
  "after": "da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
  "ref": "refs/heads/master",
  "user_id": 4,
  "user_name": "John Smith",
  "project_id": 15,
  "repository": {
    "name": "Diaspora",
    "url": "git@localhost:diaspora.git",
    "description": "",
    "homepage": "http://localhost/diaspora"
  },
  "commits": [
    {
      "id": "b6568db1bc1dcd7f8b4d5a946b0b91f9dacd7327",
      "message": "Update Catalan translation to e38cb41.",
      "timestamp": "2011-12-12T14:27:31+02:00",
      "url": "http://localhost/diaspora/commits/b6568db1bc1dcd7f8b4d5a946b0b91f9dacd7327",
      "author": {
        "name": "Jordi Mallach",
        "email": "jordi@softcatala.org"
      }
    },
    {
      "id": "da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
      "message": "fixed readme",
      "timestamp": "2012-01-03T23:36:29+02:00",
      "url": "http://localhost/diaspora/commits/da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
      "author": {
        "name": "GitLab dev user",
        "email": "gitlabdev@dv6700.(none)"
      }
    }
  ],
  "total_commits_count": 4
}
```

#### Issues events

Triggered when a new issue is created or an existing issue was updated/closed/reopened.

**Request body:**

```json
{
  "object_kind": "issue",
  "object_attributes": {
    "id": 301,
    "title": "New API: create/update/delete file",
    "assignee_id": 51,
    "author_id": 51,
    "project_id": 14,
    "created_at": "2013-12-03T17:15:43Z",
    "updated_at": "2013-12-03T17:15:43Z",
    "position": 0,
    "branch_name": null,
    "description": "Create new API for manipulations with repository",
    "milestone_id": null,
    "state": "opened",
    "iid": 23
  }
}
```

#### Merge request events

Triggered when a new merge request is created or an existing merge request was updated/merges/closed.

**Request body:**

```json
{
  "object_kind": "merge_request",
  "object_attributes": {
    "id": 99,
    "target_branch": "master",
    "source_branch": "ms-viewport",
    "source_project_id": 14,
    "author_id": 51,
    "assignee_id": 6,
    "title": "MS-Viewport",
    "created_at": "2013-12-03T17:23:34Z",
    "updated_at": "2013-12-03T17:23:34Z",
    "st_commits": null,
    "st_diffs": null,
    "milestone_id": null,
    "state": "opened",
    "merge_status": "unchecked",
    "target_project_id": 14,
    "iid": 1,
    "description": ""
  }
}
```
