HAR(HTTP Archive) 文件是一种常见的用来保存 HTTP 请求和响应的格式。本质上，HAR 文件其实就是一个 JSON 文件。

每一个 HAR Entry 都可以有以下记录存在：

• log
  • creator
  • browser
  • pages
    • pageTimings
  • entries
    • request
      • queryString
      • postData
      • params
    • response
      • cookies
      • headers
      • content
    • cache
    • timings

log

这个是一个 HAR 文件的根字段，其他字段都是该字段的子字段

{
    "log": {
        "version" : "1.2",
        "creator" : {},
        "browser" : {},
        "pages": [],
        "entries": [],
        "comment": ""
    }
}

creator

"creator": {
    "name": "Firebug",
    "version": "1.6",
    "comment": ""
}

browser

同 creator 结构完全一样

pages

"pages": [
    {
        "startedDateTime": "2009-04-16T12:07:25.123+01:00",
        "id": "page_0",
        "title": "Test Page",
        "pageTimings": {...},
        "comment": ""
    }
]

pageTimings

"pageTimings": {
    "onContentLoad": 1720,
    "onLoad": 2500,
    "comment": ""
}

entries

"entries": [
    {
        "pageref": "page_0",
        "startedDateTime": "2009-04-16T12:07:23.596Z",
        "time": 50,
        "request": {...},
        "response": {...},
        "cache": {...},
        "timings": {},
        "serverIPAddress": "10.0.0.1",
        "connection": "52492",
        "comment": ""
    }
]

request

"request": {
    "method": "GET",
    "url": "http://www.example.com/path/?param=value",
    "httpVersion": "HTTP/1.1",
    "cookies": [],
    "headers": [],
    "queryString" : [],
    "postData" : {},
    "headersSize" : 150,
    "bodySize" : 0,
    "comment" : ""
}

queryString

"queryString": [
    {
        "name": "param1",
        "value": "value1",
        "comment": ""
    },
    {
        "name": "param1",
        "value": "value1",
        "comment": ""
    }
]

postData

"postData": {
    "mimeType": "multipart/form-data",
    "params": [],
    "text" : "plain posted data",
    "comment": ""
}

params

"params": [
    {
        "name": "paramName",
        "value": "paramValue",
        "fileName": "example.pdf",
        "contentType": "application/pdf",
        "comment": ""
    }
]

response

"response": {
    "status": 200,
    "statusText": "OK",
    "httpVersion": "HTTP/1.1",
    "cookies": [],
    "headers": [],
    "content": {},
    "redirectURL": "",
    "headersSize" : 160,
    "bodySize" : 850,
    "comment" : ""
 }

content

"content": {
    "size": 33,
    "compression": 0,
    "mimeType": "text/html; charset=utf-8",
    "text": "\n",
    "comment": ""
}

cookies

"cookies": [
    {
        "name": "TestCookie",
        "value": "Cookie Value",
        "path": "/",
        "domain": "www.janodvarko.cz",
        "expires": "2009-07-24T19:20:30.123+02:00",
        "httpOnly": false,
        "secure": false,
        "comment": ""
    }
]

headers

"headers": [
    {
        "name": "Accept-Encoding",
        "value": "gzip,deflate",
        "comment": ""
    },
    {
        "name": "Accept-Language",
        "value": "en-us,en;q=0.5",
        "comment": ""
    }
]

cache

"cache": {
    "beforeRequest": {},
    "afterRequest": {},
    "comment": ""
}

beforeRequest

"beforeRequest": {
    "expires": "2009-04-16T15:50:36",
    "lastAccess": "2009-16-02T15:50:34",
    "eTag": "",
    "hitCount": 0,
    "comment": ""
}

timings

"timings": {
    "blocked": 0,
    "dns": -1,
    "connect": 15,
    "send": 20,
    "wait": 38,
    "receive": 12,
    "ssl": -1,
    "comment": ""
}

参考资料

1. http://www.softwareishard.com/blog/har-12-spec/#response