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我在使用httr將文件發佈到Salesforce's REST API時遇到了一些麻煩。我認爲this SO question可能會照顧它，但似乎並沒有。我有一種預感，這是因爲Saleforce想要一個非二進制部分和upload_file創建form_file類的對象，作爲一個二元處理，但也許有人有另一種解釋/解決方案...如何使用httr（適用於Salesforce API）POST多部分二進制和非二進制
Salesforce的詢問以下捲曲的要求插入一個新的文檔：
curl https://yourInstance.salesforce.com/services/data/v23.0/sobjects/Document/ -H
"Authorization: Bearer token" -H "Content-Type: multipart/form-data;
boundary=\"boundary_string\"" --data-binary @newdocument.json
與newdocument.json看起來像這樣：
--boundary_string
Content-Disposition: form-data; name="entity_document";
Content-Type: application/json
{
"Description" : "Marketing brochure for Q1 2011",
"Keywords" : "marketing,sales,update",
"FolderId" : "005D0000001GiU7",
"Name" : "Marketing Brochure Q1",
"Type" : "pdf"
}
--boundary_string
Content-Type: application/pdf
Content-Disposition: form-data; name="Body"; filename="2011Q1MktgBrochure.pdf"
Binary data goes here.
--boundary_string--
如果我嘗試生成的使用@吉榮的回答作爲一個有益的指導imilar輸出，我得到一個錯誤的請求錯誤：
library(httr)
library(jsonlite)
url <- "https://[Salesforce Instance]/services/data/v39.0/sobjects/Document/"
header <- add_headers(c(Authorization = "Bearer [Salesforce Key]"))
media <- tempfile()
png(media, width = 800, height = 600)
plot(cars)
dev.off()
metadata <- tempfile()
x <- data.frame(FolderId="a0a1300000ZG7u3", Name="test.png") #Salesforce Record ID and file name
json <- toJSON(unbox(x), pretty=T)
writeLines(json, metadata)
body <- list(entity_document = upload_file(metadata, type = "application/json; charset=UTF-8"),
Body = upload_file(media, type = "image/png"))
req <- POST(url, header, verbose(), body = body)
（詳細輸出）
-> POST /services/data/v39.0/sobjects/Document/ HTTP/1.1
-> Host: [Salesforce Instance]
-> User-Agent: libcurl/7.51.0 r-curl/2.3 httr/1.2.1.9000
-> Accept-Encoding: gzip, deflate
-> Accept: application/json, text/xml, application/xml, */*
-> Authorization: Bearer [Salesforce Key]
-> Content-Length: 3720
-> Expect: 100-continue
-> Content-Type: multipart/form-data; boundary=------------------------6525413b2350e313
->
<- HTTP/1.1 100 Continue
>> --------------------------6525413b2350e313
>> Content-Disposition: form-data; name="entity_document"; filename="file1510059b5200f"
>> Content-Type: application/json
>>
>> {
>> "FolderId": "a0a1300000ZG7u3",
>> "Name": "test.png"
>> }
>>
>> --------------------------6525413b2350e313
>> Content-Disposition: form-data; name="Body"; filename="file151001ac96950"
>> Content-Type: image/png
>>
>> ‰PNG
>>
>>
>> --------------------------6525413b2350e313--
<- HTTP/1.1 400 Bad Request
在第一部分中的文件名以外，這是相當接近期望的輸出，但Salesforce的返回消息：
content(req)
[[1]]
[[1]]$message
[1] "Cannot include more than one binary part"
[[1]]$errorCode
[1] "INVALID_MULTIPART_REQUEST"
我只用JSON嘗試，但得到一個稍微不同的錯誤請求：
body <- list(entity_document= json,
Body = upload_file(media, type = "image/png"))
-> Content-Type: multipart/form-data; boundary=------------------------ecbd3787f083e4b1
->
<- HTTP/1.1 100 Continue
>> --------------------------ecbd3787f083e4b1
>> Content-Disposition: form-data; name="entity_document"
>>
>> {
>> "FolderId": "a0a1300000ZG7u3",
>> "Name": "test.png"
>> }
>> --------------------------ecbd3787f083e4b1
>> Content-Disposition: form-data; name="Body"; filename="file151001ac96950"
>> Content-Type: image/png
>>
>> ‰PNG
>>
>>
>> --------------------------ecbd3787f083e4b1--
content(req)
[[1]]
[[1]]$message
[1] "Multipart message must include a non-binary part"
[[1]]$errorCode
[1] "INVALID_MULTIPART_REQUEST"
挖掘到的細節，但在我看來，捲曲無論是讀取和張貼元數據文件作爲二進制如果我使用upload_file或職位不JSON內容類型，如果我將它張貼的字符。這是唯一的問題嗎？如果是這樣，有沒有辦法修改處理程序接受內容類型？
任何幫助非常感謝！