Only close if connection returns fewer bytes than requested (#525)

Fixes #524

NEWS.md

@@ -1,5 +1,6 @@
 # httr2 (development version)
 
+* `req_body_file()` now works with files >64kb once more (#524).
 * New `req_perform_connection()` for working with streaming data. Unlike `req_perform_stream()` which uses callbacks, `req_perform_connection()` returns a regular response object with a connection as the body. It's paired with `resp_stream_bytes()`, `resp_stream_lines()`, and `resp_stream_sse()` that allows you to stream chunks as you want them. Unlike `req_perform_stream()` it supports `req_retry()` (with @jcheng5, #519).
 
 # httr2 1.0.3

R/req-body.R

@@ -213,7 +213,7 @@ req_body_apply <- function(req) {
         return(raw())
       }
       out <- readBin(con, "raw", nbytes)
-      if (length(out) <= nbytes) {
+      if (length(out) < nbytes) {
         close(con)
         done <<- TRUE
         con <<- NULL

tests/testthat/test-req-body.R

@@ -1,16 +1,17 @@
 test_that("can send file", {
-  skip_on_os("windows") # fails due to line ending difference
-
-  path <- tempfile()
-  writeLines("this is a test", path)
+  path <- withr::local_tempfile()
+  # curl requests in 64kb chunks so this will hopefully illustrate
+  # any subtle problems
+  x <- strrep("x", 128 * 1024)
+  writeChar(x, path, nchar(x))
 
   resp <- request_test("/post") %>%
     req_body_file(path, type = "text/plain") %>%
     req_perform()
 
   json <- resp_body_json(resp)
   expect_equal(json$headers$`Content-Type`, "text/plain")
-  expect_equal(json$data, "this is a test\n")
+  expect_equal(json$data, x)
 })
 
 test_that("can send file with redirect", {