R Plumber API的响应不一致

Question

我创建了一个Plumber API，该API接受base64编码的字符串并从中提取数据，将其转换为数据框，然后将数据作为JSON返回。问题是在Swagger和Postman上进行测试时，我得到的响应不一致。发送请求时，我通常会收到响应404-找不到资源，但是我时不时地返回200响应，其中包含以JSON正确提供的数据。

供参考：base64编码的字符串对应于此document

的第一页

水管工代码是：

# plumber.R

#* Echo back the input
#* @param encoded_data Base-64 encoded_data pdf
#* @get /extractAML
function(encoded_data){
  library(tidyverse)
  library(pdftools)
  library(base64enc)
  input <- strsplit(rawToChar(base64decode(encoded_data)), "\n")
  df <- data.frame(key = input[[1]], value = lead(input[[1]],1))
  index <- which(grepl("^[0-9]{1,2}\\.",df$key))
  df <- df[index,]
  df <- df %>% slice(1:10)
  df
}

然后我运行

r <- plumb("plumber.R")
r$run(port=8002)

公开API。

我在Swagger页面上使用“尝试一下”，然后粘贴base64编码的字符串，然后执行。最初返回404，但尝试了更多次（可能是10次，可能是20次）后，我得到了成功的呼叫。 JSON如下所示。但是几秒钟后，我再次单击“执行”，并再次获得202响应。

[
  {
    "key": "1. Name of Institution Completing\r",
    "value": "                                                     East West Bank\r"
  },
  {
    "key": "2. Date Completed:\r",
    "value": "                                                     March 13th 2018\r"
  },
  {
    "key": "3. Completed by:\r",
    "value": "                                                     Name:     Myrna Olvera\r"
  },
  {
    "key": "4. Date Established:\r",
    "value": "                                                     January 1, 1972\r"
  },
  {
    "key": "5. Number of Branches:\r",
    "value": "                                                     120+ in USA, 1 branch in Hong Kong and 2 representative offices in\r"
  },
  {
    "key": "6. Type of Business:                                 Commercial and Personal Banking\r",
    "value": "7. Registration Certificate No./License No.:\r"
  },
  {
    "key": "7. Registration Certificate No./License No.:\r",
    "value": "                                                     Federal Reserve ID #197478, FDIC # 31628, CA DFI #1748\r"
  },
  {
    "key": "8. Address:\r",
    "value": "                                                     135 North Los Robles Avenue, California, CA 91101, USA\r"
  },
  {
    "key": "9. Principal Place of Business:\r",
    "value": "                                                     135 North Los Robles Avenue, California, CA 91101, USA\r"
  },
  {
    "key": "10. Location Of The Head Office:\r",
    "value": "                                                     135 North Los Robles Avenue, California, CA 91101, USA\r"
  }
]

我尝试在Postman中运行API调用并获得相同的结果-大多数情况下，我会收到404响应，但偶尔会返回预期的json。当我在bash中运行curl时也是如此。

完整的Curl语句为：

curl -X GET "http://127.0.0.1:8002/extractAML?encoded_data=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%3D" -H  "accept: application/json"

有人知道为什么我会看到这种不一致的行为吗？我正在使用最新的可用水管工包装。