我从 API 调用中提取数据，如下所示。请记住，dput 中下面 99% 的数据都是无用的，我只需要它来重现这个问题。运行它应该返回如下所示的响应:
[[1]]
Response [https://test.api.com/v4/12345/information]
Date: 2021-09-02 20:24
Status: 204
Content-Type: <unknown>
<EMPTY BODY>
[[2]]
Response [https://test.api.com/v4/23456/information]
Date: 2021-09-02 20:24
Status: 204
Content-Type: <unknown>
<EMPTY BODY>
我想做的是从这些响应中提取信息，如下所示:
<表类=“s-表”>
<标题>
网址
日期
状态
<正文>
https://test.api.com/v4/12345/information
21年9月2日20:24
204
https://test.api.com/v4/23456/information
21年9月2日20:24
204
如果这只是一个响应，我可以通过执行 response_blurb$url 和 response_blurb$date 之类的操作来调用此数据，但如果有多个响应，我就无法这样做。
dput 如下:
response_blurb <- list(structure(list(url = "https://test.api.com/v4/12345/information",
status_code = 204L, headers = structure(list(`cache-control` = "no-cache",
pragma = "no-cache", expires = "-1", `strict-transport-security` = "max-age=31536000",
`x-content-type-options` = "nosniff", `x-xss-protection` = "1; mode=block",
date = "Thu, 02 Sep 2021 20:24:43 GMT", `x-cdn` = "Imperva",
`x-iinfo` = "7-62735819-62735821 NNNY CT(32 73 0) RT(1630614282821 31) q(0 0 0 -1) r(1 1) U6"), class = c("insensitive",
"list")), all_headers = list(list(status = 204L, version = "HTTP/1.1",
headers = structure(list(`cache-control` = "no-cache",
pragma = "no-cache", expires = "-1", `strict-transport-security` = "max-age=31536000",
`x-content-type-options` = "nosniff", `x-xss-protection` = "1; mode=block",
date = "Thu, 02 Sep 2021 20:24:43 GMT", `x-cdn` = "Imperva",
`x-iinfo` = "7-62735819-62735821 NNNY CT(32 73 0) RT(1630614282821 31) q(0 0 0 -1) r(1 1) U6"), class = c("insensitive",
"list")))), cookies = structure(list(domain = c("#HttpOnly_.secure",
".secure", ".secure", "#HttpOnly_api.secure"
), flag = c(TRUE, TRUE, TRUE, FALSE), path = c("/", "/",
"/", "/"), secure = c(TRUE, TRUE, TRUE, FALSE), expiration = structure(c(1661415232,
Inf, Inf, Inf), class = c("POSIXct", "POSIXt")), name = c("visid_incap_754428",
"nlbi_754428", "incap_ses_1286_754428", "ASP.NET_SessionId"
), value = c("kpT+BJeYSuGXS5d9taQHzJiYJmEAAAAAQUIPAAAAAAAyrXukfkBb9mpZHnGcr6zX",
"pprNEnQFZjMz5rnaoK07BAAAAADZLQdRn3tbElZnp5AzMYef", "uTPqYDW0LgRsKI+vbsrYEW0xMWEAAAAAkinWhXc+BLr4Y9HRlIvAtQ==",
"5ndj041zg1zda2us2ai3eape")), row.names = c(NA, -4L), class = "data.frame"),
content = raw(0), date = structure(1630614283, class = c("POSIXct",
"POSIXt"), tzone = "GMT"), times = c(redirect = 0, namelookup = 0.052203,
connect = 0.068757, pretransfer = 0.094581, starttransfer = 0,
total = 0.193515), request = structure(list(method = "POST",
url = "https://test.api.com/v4/12345/information",
headers = c(Accept = "application/json", Authorization = "Basic KFOSJFBfoepsEOTPSDnrfjs395031==",
`Content-Type` = "application/json"), fields = NULL,
options = list(useragent = "libcurl/7.64.1 r-curl/4.3.2 httr/1.4.2",
post = TRUE, postfieldsize = 157L, postfields = as.raw(c(0x20
))), auth_token = NULL, output = structure(list(), class = c("write_memory",
"write_function"))), class = "request"), handle = '<pointer: 0x7ffb26c10060>'), class = "response"),
structure(list(url = "https://test.api.com/v4/23456/information",
status_code = 204L, headers = structure(list(`cache-control` = "no-cache",
pragma = "no-cache", expires = "-1", `strict-transport-security` = "max-age=31536000",
`x-content-type-options` = "nosniff", `x-xss-protection` = "1; mode=block",
date = "Thu, 02 Sep 2021 20:24:43 GMT", `x-cdn` = "Imperva",
`x-iinfo` = "7-62735819-62735821 SNNy RT(1630614282821 130) q(0 0 0 -1) r(1 1) U6"), class = c("insensitive",
"list")), all_headers = list(list(status = 204L, version = "HTTP/1.1",
headers = structure(list(`cache-control` = "no-cache",
pragma = "no-cache", expires = "-1", `strict-transport-security` = "max-age=31536000",
`x-content-type-options` = "nosniff", `x-xss-protection` = "1; mode=block",
date = "Thu, 02 Sep 2021 20:24:43 GMT", `x-cdn` = "Imperva",
`x-iinfo` = "7-62735819-62735821 SNNy RT(1630614282821 130) q(0 0 0 -1) r(1 1) U6"), class = c("insensitive",
"list")))), cookies = structure(list(domain = c("#HttpOnly_.secure",
".secure", ".secure", "#HttpOnly_api.secure"
), flag = c(TRUE, TRUE, TRUE, FALSE), path = c("/", "/",
"/", "/"), secure = c(TRUE, TRUE, TRUE, FALSE), expiration = structure(c(1661415232,
Inf, Inf, Inf), class = c("POSIXct", "POSIXt")), name = c("visid_incap_754428",
"nlbi_754428", "incap_ses_1286_754428", "ASP.NET_SessionId"
), value = c("kpT+BJeYSuGXS5d9taQHzJiYJmEAAAAAQUIPAAAAAAAyrXukfkBb9mpZHnGcr6zX",
"pprNEnQFZjMz5rnaoK07BAAAAADZLQdRn3tbElZnp5AzMYef", "uTPqYDW0LgRsKI+vbsrYEW0xMWEAAAAAkinWhXc+BLr4Y9HRlIvAtQ==",
"5ndj041zg1zda2us2ai3eape")), row.names = c(NA, -4L), class = "data.frame"),
content = raw(0), date = structure(1630614283, class = c("POSIXct",
"POSIXt"), tzone = "GMT"), times = c(redirect = 0, namelookup = 3.8e-05,
connect = 4e-05, pretransfer = 0.000118, starttransfer = 0,
total = 0.072601), request = structure(list(method = "POST",
url = "https://test.api.com/v4/23456/information",
headers = c(Accept = "application/json", Authorization = "Basic KFOSJFBfoepsEOTPSDnrfjs395031==",
`Content-Type` = "application/json"), fields = NULL,
options = list(useragent = "libcurl/7.64.1 r-curl/4.3.2 httr/1.4.2",
post = TRUE, postfieldsize = 157L, postfields = as.raw(c(0x20
))), auth_token = NULL,
output = structure(list(), class = c("write_memory",
"write_function"))), class = "request"), handle = '<pointer: 0x7ffb26c10060>'), class = "response"))
最佳答案
正如您提到的，您可以为一个 burb 运行 response_blurb$url ，但对于 blurb 列表，您必须执行 response_blurb[[1]]$url。
可以对其进行扩展以捕获您想要的三个变量 response_blurb[[1]][c('url', 'date', 'status_code')]。这可以使用 sapply 迭代 [[1]] 和 [[2]]。
把它们放在一起
sapply(response_blurb, '[', c('url', 'date', 'status_code'))
或返回数据框
data.frame(t(sapply(response_blurb, '[', c('url', 'date', 'status_code'))))
#-----
url date status_code
1 https://test.api.com/v4/12345/information 1630614283 204
2 https://test.api.com/v4/23456/information 1630614283 204
关于r - 从 API 响应列表中提取数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/69037017/