# Understanding HTTP Requests

The HTTP tab of a profile contains a list of all the HTTP requests the profiled script made.

![](../images/http-requests-list.png)

The list contains:

- the number of calls made to that URL;
- the related wall-time;
- and the network consumption.

The displayed wall-time refers to the function gathering information on the query. For instance, it could be `curl_multi_info_read` for a cURL query.

## Request Metadata

The Request Metadata are displayed by clicking on the URL in the list.

![](../images/http-requests-metadata.png)

The Metadata may contain:

- the request Content-Type;
- the HTTP Status Code;
- the Total Time: time from the request start until the end of the transfer. When a redirect is followed, the time from each request is added together;
- a breakdown of the Total Time:

    - Domain Name lookup time: time from the request start until the name resolving was completed;
    - Connect Time: time from the request start until the connection to the remote host (or proxy) was completed. When a redirect is followed, the time from each request is added together;
    - Pre-Transfer Time: time from the request start until the file transfer is about to begin. When a redirect is followed, the time from each request is added together;
    - Start-Transfer Time: time from the request start until the first byte is received. When a redirect is followed, the time from each request is added together;
- an eventual title for that request;
- and the Open Telemetry Measured Total Time.

## Naming an HTTP request

The *Blackfire HTTP Title* field of the HTTP Request Metadata can be defined by adding the `X-Blackfire-HTTP-Query-Title` header to the request.

![](../images/http-requests-title.png)

This title can provide a context easing the understanding of the profiles of applications heavily relying on external HTTP requests.

## Locating an HTTP request

The function call that initiated a specific HTTP request can be located by searching the URL in [callgraph](understanding-call-graphs)search bar.

![](../images/http-requests-search.png)