[Google Flights API] No results on our API

It's the X-Goog-Batchexecute-Bgr HTTP header, which will be validated on Google's Side.

X-Goog-Batchexecute-Bgr composes Chrome major version (e.g. 125) and post body. Unmatched Chrome major version and post body will sometimes make Google Flight return fewer or empty results.

Example curl request

curl 'https://www.google.com/_/TravelFrontendUi/data/travel.frontend.flights.FlightsFrontendService/GetShoppingResults?hl=en&gl=us' \
  -H 'user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36' \
  -H 'x-goog-batchexecute-bgr: [";5fu4-6PQAAZb7ogee-5fXCQq3vhsWd8mADQBEArZ1LRrcp0CEUnxu8LF-ouTElMW1zvBjndG_IlIpaRUFzzH-O5A2ULkrY_2JY9jWJ37HwAAADRPAAAAAnUBB2MAPq81VS7VBjBrp-ux7QZSoLv_Muer7Uq43V9F2Uk6B5xD_gWBT-0cXSS6KGF80UUkw7RWULRmVq6v4muWav19hASUJ0GjF1Irn_Qd4luEq9saA90apdZkL7R2cieeOgCd8W2LsLSqC8ZxlDVA13eyP7aXKK9xAW0mxcKUQqvEtbISlg3_YHOxBSrDuE94SV9tOxcWT7EMXC1SgJbO2wXswvE9brvzVNBGuFJnS8RtV4q_wdneXzUUPJUYJzOMp2mHeEntz8f6myeVoFP-VLfoRYelJ9vQ0OqGXo5eOws8mG_YE6-d02VTPS-PAI9h42MIkRVNAPKTKPlg5JHv16bwTkatLXz40Z7MkgF8mekD5lLYy1yqYlpQ170ZpQRWUL0VqR4RhHPh0H7-iTcoQJ5kdlI8pGC2p3pbajMB1AfNOi8U4Ik0v5UDX9ODumd54UA_zTmdeLSJNz3M7lSkeJVS-SEVBpB_ZybjrqK20Eu-hcPxeqR2kI7P-isbZw_izJIQCzkRxqHADoRUNuLlfAqyTJSO1nqvUudVHeszHw39ysNjvPw8Z73KuYO5WkuKKXSI0cWvrmE1fTmgRKgBjAskw3JwLnSu-9GcrckbCW6sBi4VCrtq0g5kpcRzOFFFYtVSBgCxkXVidD_qRm2S1YGKnDXP90Bu-6JdutXLK_iPGzfMxG1Hi8YDGi7qfp-xSgNOTTQxmmy2PkzwiwAau0ZlZtClMflHstCyQV3EX8dwiNWmyQSb0OMw4Pgr-y2lBg47qgysmZFxjkuLA6RhyPcjNSqLVgvRWB8vGzcbc01sIDKxmyJ7LPWxKodft4Gls-LO3iJbt0I0m_DLkZv1MHJsy4R7DQKX1W87PVhDVbzEr_oMaIdcOGIHQsiIqYVWQ9JF4Xd71KTrSUAyugYThmcGicOhiS-lCUmtd0htHBuHWw069R8dwhvdOQ7M4uPrdo5ZA_4t3qoIg5XjAviFN9fhgY13OR2kdKR4IM6ycMnnSqQdjo3sKC2sKRkohGQSyufuc-1OAUbWBVdhe9s462sN-M0rl7FtRNSXRlXAmEndYFGtbBnavR4MxPBT0g207LxU4uQJ-V5msUa05LLiZp9WRlnyHJwkf9T9wj5qXQhVqOHCr6E_a0CC-Du6CzUKUk9qwx7IaapPug5rVs8twN95Tu9ial3AlzjyJAHxPvLhMEjb1mfeDvwCciDFv51ndLsNi47c8P26RLjG6h3E0o-ymFUMHSb6yvHvcDwDoaRGKCJKbSMC1RU_0AzH8A1BTC1DqZ9GSo4KNZCoJLC-0IxEhr438ExZuBJoR6i14Pje_UM6PiUWF52epEb2O1u2Rd7-jRsljrh-3bmrBgYaXkDRTfMCWtcUom_VcYTk91mj4S1UqW6aRyQs3-ouBO8iO0Y3NUj6MO6jtyT9g7kA4GFlbcBzaIy7tnpnfHvRd8iFBAXVg6DQn1-c4Mq4iGPElk9G5ejP0stENIiVW9z1-QgQEHbxUJHh0-JMoJvz81_7W2-itT4X9pSy5JSCvKKIQUzAiufgxXKCLkzL16v5MV6MT1PNZj0AzFalHvCXLjBm3SGncs5czoKxS6xn4r5bJ0aQ2y6ld9H16Fr5FExQ7E0llIxavTeoaWFjsT8r-XJNF2DRNfUyyAU",null,null,17,null,null,null,0,"5"]' \
  -H 'x-goog-ext-259736195-jspb: ["en-US","US","USD",2,null,[-480],null,[[72446894,97495046,97554504]],7,[]]' \
  --data-raw 'f.req=%5Bnull%2C%22%5B%5B%5D%2C%5Bnull%2Cnull%2C2%2Cnull%2C%5B%5D%2C1%2C%5B1%2C0%2C0%2C0%5D%2Cnull%2Cnull%2Cnull%2Cnull%2Cnull%2Cnull%2C%5B%5B%5B%5B%5B%5C%22DLI%5C%22%2C0%5D%5D%5D%2C%5B%5B%5B%5C%22PQC%5C%22%2C0%5D%5D%5D%2Cnull%2C2%2Cnull%2Cnull%2C%5C%222025-04-01%5C%22%2Cnull%2Cnull%2Cnull%2Cnull%2Cnull%2Cnull%2Cnull%2C3%5D%5D%2Cnull%2Cnull%2Cnull%2C1%5D%2C0%2C0%2C0%2C1%5D%22%5D&'

serpapi / public-roadmap

[Google Flights API] No results on our API #1656