對native-lands.ca的RhttrPOST請求

我正在嘗試來自以下位置的多邊形重疊（POST 請求）：https ://native-land.ca/resources/api-docs/

我下面的內容回傳一個空串列：

library(sf)
library(geojsonsf)
library(httr)

# Create a polygon
lon = c(-114.88984, -114.05445)
lat = c(48.99889,49.46062)
poly_df = data.frame(lon, lat)

poly <- poly_df %>% 
  st_as_sf(coords = c("lon", "lat"), 
           crs = 4326) %>% 
  st_bbox() %>% 
  st_as_sfc()  %>%
  st_as_sf

poly$id=1:length(poly)

# Convert sf into geoJSON
geo <-  sf_geojson(poly)

# Set up POST request
body <- list(maps = "territories", polygon_geojson = geo)
url <- "https://native-land.ca/wp-json/nativeland/v1/api/index.php"
r <- POST(url, body = body)

# View request
content(r, "text") 

我不確定我在這里錯過了什么......

uj5u.com熱心網友回復：

您的 JSON 格式不正確。你body是一個 R 串列。可能有更好的方法來做到這一點，但是

body <- paste0('{"maps" : "territories", "polygon_geojson" :', geo, '}')

作品。

uj5u.com熱心網友回復：

我已經能夠使用以下代碼從 API 中獲得一些東西：

library(sf)
library(geojsonsf)
library(httr)

# Set up POST request
body <- '{
    "maps" : "territories",
    "polygon_geojson" : {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -105.556640625,
              58.17070248348609
            ],
            [
              -107.09472656249999,
              57.11238500793404
            ],
            [
              -104.853515625,
              56.145549500679074
            ],
            [
              -98.6572265625,
              56.70450561416937
            ],
            [
              -97.55859375,
              57.89149735271034
            ],
            [
              -99.8876953125,
              58.49369382056807
            ],
            [
              -103.7548828125,
              58.768200159239576
            ],
            [
              -105.556640625,
              58.17070248348609
            ]
          ]
        ]
      }
    }
  ]
}
}'
  
  
url <- "https://native-land.ca/wp-json/nativeland/v1/api/index.php"
r <- POST(url, body = body)

# View request
content(r, "text") 

[1] "[{\"id\":\"d544aaffc99643ed5890d6ab4f54a680\",\"type\":\"Feature\",\"properties\":{\"Name\":\"Denendeh (D\\u00ebn\\u00ebs\\u0173\\u0142in\\u00eb\\u0301 N\\u00ebn\\u00e9)\",\"ID\":35980,\"Slug\":\"dene-chipewyan\",\"description\":\"https:\\/\\/native-land.ca\\/maps\\/territories\\/dene-chipewyan\\/\",\"color\":\"#436EC9\"},\"geometry\":{\"coordinates\":[[[-96.63408741077633,61.64147629881566],[-98.10883373826738,62.14926679661755],[-99.58358006572836,62.64868046813025],[-100.69057945540021,63.550057030861424],[-101.98549638569584,64.1512659405242],[-102.90298123096808,64.27738508558723],[-103.79956957639563,64.43031974514693],[-105.30212742812142,64.58482598184943],[-107.30708523193934,64.65971781808585],[-108.29168522758245,64.4251810535307],[-109.22015836584305,63.81194802913117],[-109.41647267903214,63.341804356252794],[-110.58567049859238,62.98899663049256],[-111.29184601986053,62.816448287931024],[-113.26702231819554,62.68657811581127],[-114.63308197403722,62.51291000825436],[-114.94516477475032,62.3390758004584],[-115.80528246536171,61.786166936948284],[-116.45282295998211,61.54583657799563],[-116.77237757017258,61.168338657243886],[-116.76954222003373,60.82919839319197],[-116.39186585911546,60.44020683170338],[-116.18329486811704,59.74407856677357],[-115.54877168969935,59.38181959909821],[-115.54877168969935,58.7504865990982],[-115.10931868969935,58.153769599098204],[-114.3071721085077,58.0334226278233],[-114.30078812993618,58.026404044666826],[-114.31695458978143,58.01155818774196],[-114.30329970480722,58.01559593012878],[-114.30355944715201,58.006213480810246],[-114.28521398495958,58.00015602732984],[-114.30154239276168,57.99986729621165],[-114.2324336932758,58.00006459437617],[-114.2179039083603,57.998413120418576],[-114.20072246415279,57.99409062411738],[-113.19129496507821,57.61934710781196],[-112.36931530008984,57.14816421936794],[-111.94719692187894,56.57541961316653],[-111.52507854366625,55.99386687776271],[-110.61573670470055,55.17775079007487],[-109.74103353557975,55.12608179838786],[-108.8118676470692,55.03294224232465],[-107.87372544301775,55.089318675779],[-107.09208238299203,55.301881069588205],[-106.58945071419558,55.64453901182378],[-105.5781968273977,56.09363608265079],[-103.00794204976752,56.67643153056056],[-102.75803074468901,56.94973818295181],[-102.78967126749963,57.33765640578148],[-102.60642142756039,57.78980163818225],[-102.03227156963517,58.14440773340992],[-101.6014734596441,58.2580590166059],[-100.74407819448587,58.37532601269617],[-99.28900568969935,58.613682599098205],[-97.44330268969935,58.613682599098205],[-95.59759968969935,58.613682599098205],[-94.90984344589211,58.67933094829942],[-94.71869368969935,58.841390599098204],[-94.71869368969935,59.337109599098206],[-94.71869368969935,60.0015845990982],[-94.44936488770298,60.29809720990376],[-94.29009709351574,60.565392354729724],[-94.21708049484194,60.66966191347518],[-94.39146079197296,60.79374335345621],[-94.30739850835715,60.86035134991189],[-94.55665658072905,60.98513335899635],[-94.97424155794928,61.105354222533805],[-95.61205007396443,61.14834865074215],[-96.63408741077633,61.64147629881566]]],\"type\":\"Polygon\"}},{\"id\":\"afe8efc325cec57f5c5e3ac105d39280\",\"type\":\"Feature\",\"properties\":{\"Name\":\"D\\u00ebn\\u00e9ndeh\",\"ID\":33550,\"Slug\":\"denendeh\",\"description\":\"https:\\/\\/native-land.ca\\/maps\\/territories\\/denendeh\\/\",\"color\":\"#DADB1C\"},\"geometry\":{\"coordinates\":[[[-119.73089394254217,54.403591293327366],[-119.57741436346332,54.46759894603795],[-118.53006365445373,55.05177082112249],[-117.02550104586881,55.530421068025305],[-116.18459019859705,56.01421205075701],[-115.9179439996436,56.44132290489213],[-115.45717561680154,56.95695870459926],[-114.98797568499734,57.479055792274664],[-114.59162941384342,57.93777529121064],[-114.13086103100083,58.183840577569015],[-113.27071609694876,58.34252065706295],[-112.72629151562514,58.38113130256929],[-112.23331207693487,58.29835548537716],[-111.58263728468424,58.03324615739575],[-111.30472097418988,57.73282238114464],[-110.71122223908684,57.395775587749654],[-110.32719364578215,57.15040821083471],[-109.97807674277657,56.80796284908649],[-109.62895983977457,56.09411328190373],[-109.24493124646989,55.54494826624341],[-109.03546110466797,55.06804525113094],[-108.54669744046231,54.78719780950195],[-107.4295233508509,54.92786662665725],[-106.87093630604701,55.48564873171486],[-105.8934089776357,55.95754822352461],[-105.02061672012891,56.55867844939203],[-104.38378004008051,57.02219596444519],[-103.33642933107095,57.51299738032699],[-102.6032838347643,57.848963387418024],[-102.07960848025954,57.94173544116097],[-101.52102143545206,57.94173544116097],[-100.82278762953086,57.904655348590865],[-98.90264466301092,57.99728381824326],[-97.78547057339594,58.10812252679395],[-96.73811986438638,58.32877004793593],[-95.06235872997105,58.60265517616378],[-94.32921323366435,58.765963951037605],[-94.11974309187252,59.01848215038933],[-93.98009633067598,59.65938627475029],[-93.98009633067598,60.25364640862702],[-94.04991971127424,60.58111080783223],[-94.57345889538489,60.914440211716055],[-95.55262026847646,61.15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