GA request for extracting sessions

request.json

{
  "reportRequests": [
    {
      "viewId": "YOUR_VIEW_ID_IS_HERE",
      "dateRanges": [
        {
          "startDate": "2015-01-01",
          "endDate": "2019-04-10"
        }
      ],
      "dimensions": [
        {
          "name": "ga:previousPagePath"
        },
        {
          "name": "ga:pagePath"
        },
        {
          "name": "ga:dateHour"
        },
        {
          "name": "ga:browserSize"
        }
      ],
      "orderBys": [
        {
          "fieldName": "ga:dateHour",
          "sortOrder": "DESCENDING"
        }
      ],
      "dimensionFilterClauses": [
        {
          "filters": [
            {
              "dimensionName": "ga:previousPagePath",
              "operator": "EXACT",
              "not": true,
              "expressions": [
                "(entrance)"
              ]
            }
          ]
        }
      ],
      "metrics": [
        {
          "expression": "ga:pageviews"
        }
      ],
      "pageSize": 5000,
      "hideTotals": true,
      "hideValueRanges": true
    }
  ]
}

response_example.json

{
  "reports": [
    {
      "columnHeader": {
        "dimensions": [
          "ga:previousPagePath",
          "ga:pagePath",
          "ga:dateHour",
          "ga:browserSize"
        ],
        "metricHeader": {
          "metricHeaderEntries": [
            {
              "name": "ga:pageviews",
              "type": "INTEGER"
            }
          ]
        }
      },
      "data": {
        "rows": [
          {
            "dimensions": [
              "/",
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "2019041010",
              "1840x980"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/",
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "2019040909",
              "1670x840"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2016/09/27/prerendering-pages-in-browsers.html",
              "/",
              "2019040909",
              "1670x840"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2016/10/29/custom-templates-in-polymer-components.html",
              "/2016/05/01/data-sharing-between-web-components-on-polymer.html",
              "2019040909",
              "1860x860"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "/2018/04/08/automate-precaching-resources.html",
              "2019040909",
              "1670x840"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/",
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "2019040811",
              "1840x980"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/",
              "/2018/04/08/automate-precaching-resources.html",
              "2019040718",
              "1580x790"
            ],
            "metrics": [
              {
                "values": [
                  "2"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/",
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "2019040718",
              "1580x790"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2018/04/08/automate-precaching-resources.html",
              "/",
              "2019040718",
              "1580x790"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2018/04/08/automate-precaching-resources.html",
              "/about-me.html",
              "2019040718",
              "1580x790"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "/",
              "2019040718",
              "1580x790"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/2017/06/05/service-worker-as-fallback-to-the-prerender-resource-hint.html",
              "/2016/09/27/prerendering-pages-in-browsers.html",
              "2019040320",
              "2610x1330"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          },
          {
            "dimensions": [
              "/",
              "/2019/03/23/service-worker-in-place-of-sinon-js.html",
              "2019040213",
              "1970x1050"
            ],
            "metrics": [
              {
                "values": [
                  "1"
                ]
              }
            ]
          }
        ],
        "rowCount": 597
      },
      "nextPageToken": "20"
    }
  ]
}

Please, replace YOUR_VIEW_ID_IS_HERE with your ID which can be found by following these steps.