This line will not actually give you a response. Let me explain.

When I send this:

```
GET /repos/octokit/octokit.net/pulls/228/comments HTTP/1.1
User-Agent: Fiddler
Host: api.github.com
Accept: application/vnd.github.v3+json
```

I get this (modified for succinctness):

```
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Status: 200 OK
X-GitHub-Media-Type: github.v3; format=json
Content-Length: 2
X-GitHub-Request-Id: 836BB839:1D7D:9CEF144:528A472E
```

Switching it over to /issues/ is the fix:

```
GET /repos/octokit/octokit.net/issues/228/comments HTTP/1.1
User-Agent: Fiddler
Host: api.github.com
Accept: application/vnd.github.v3+json
```

which gives me: 

```
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Status: 200 OK
X-GitHub-Media-Type: github.v3; format=json
Content-Length: 9901
X-GitHub-Request-Id: 836BB839:1D7D:9D669B1:528A4B4B
```

Why am I raising this? Because the data from the API for the Pull Request uses a mix of `/pull/` and `/issues/` - the documentation only mentions `/pull/`:

```
{
  "url": "https://api.github.com/repos/octokit/octokit.net/pulls/228",
  ...
  "_links": {
    "self": {
      "href": "https://api.github.com/repos/octokit/octokit.net/pulls/228"
    },
    "html": {
      "href": "https://github.com/octokit/octokit.net/pull/228"
    },
    "issue": {
      "href": "https://api.github.com/repos/octokit/octokit.net/issues/228"
    },
    "comments": {
      "href": "https://api.github.com/repos/octokit/octokit.net/issues/228/comments"
    },
    "review_comments": {
      "href": "https://api.github.com/repos/octokit/octokit.net/pulls/228/comments"
    },
    "statuses": {
      "href": "https://api.github.com/repos/octokit/octokit.net/statuses/a01857ecd5b6e1b0acb9f51a8230375c87c03f51"
    }
  },
  ... 
}
```

cc @pengwynn