update: handle POST request unexpected EOF

[mhnaufal]

Resolve unexpected EOF when making a POST request.

Related issues = #283

Reference

• https://stackoverflow.com/questions/17714494/golang-http-request-results-in-eof-errors-when-making-multiple-requests-successi
• https://bugz.pythonanywhere.com/golang/Unexpected-EOF-golang-http-client-error

requester_test.go result

=== RUN   TestN

Summary:
  Total:	0.0104 secs
  Slowest:	0.0025 secs
  Fastest:	0.0006 secs
  Average:	0.0010 secs
  Requests/sec:	1927.3393
  

Response time histogram:
  0.001 [1]	|■■■■■■
  0.001 [7]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  0.001 [7]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  0.001 [1]	|■■■■■■
  0.001 [2]	|■■■■■■■■■■■
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [2]	|■■■■■■■■■■■


Latency distribution:
  10% in 0.0007 secs
  25% in 0.0008 secs
  50% in 0.0009 secs
  75% in 0.0010 secs
  90% in 0.0023 secs
  95% in 0.0025 secs
  0% in 0.0000 secs

Details (average, fastest, slowest):
  DNS+dialup:	0.0006 secs, 0.0003 secs, 0.0011 secs
  DNS-lookup:	0.0000 secs, 0.0000 secs, 0.0000 secs
  req write:	0.0001 secs, 0.0000 secs, 0.0004 secs
  resp wait:	0.0002 secs, 0.0001 secs, 0.0005 secs
  resp read:	0.0001 secs, 0.0000 secs, 0.0002 secs

Status code distribution:
  [200]	20 responses



--- PASS: TestN (0.01s)
=== RUN   TestQps
--- PASS: TestQps (1.01s)

=== RUN   TestRequest

Summary:
  Total:	0.0018 secs
  Slowest:	0.0018 secs
  Fastest:	0.0018 secs
  Average:	0.0018 secs
  Requests/sec:	546.8665
  

Response time histogram:
  0.002 [1]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|
  0.002 [0]	|


Latency distribution:
  0% in 0.0000 secs
  0% in 0.0000 secs
  0% in 0.0000 secs
  0% in 0.0000 secs
  0% in 0.0000 secs
  0% in 0.0000 secs
  0% in 0.0000 secs

Details (average, fastest, slowest):
  DNS+dialup:	0.0012 secs, 0.0012 secs, 0.0012 secs
  DNS-lookup:	0.0000 secs, 0.0000 secs, 0.0000 secs
  req write:	0.0001 secs, 0.0001 secs, 0.0001 secs
  resp wait:	0.0003 secs, 0.0003 secs, 0.0003 secs
  resp read:	0.0001 secs, 0.0001 secs, 0.0001 secs

Status code distribution:
  [200]	1 responses



--- PASS: TestRequest (0.00s)
=== RUN   TestBody

Summary:
  Total:	0.0110 secs
  Slowest:	0.0014 secs
  Fastest:	0.0010 secs
  Average:	0.0011 secs
  Requests/sec:	912.1757
  

Response time histogram:
  0.001 [1]	|■■■■■■■■■■
  0.001 [4]	|■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
  0.001 [0]	|
  0.001 [2]	|■■■■■■■■■■■■■■■■■■■■
  0.001 [0]	|
  0.001 [1]	|■■■■■■■■■■
  0.001 [1]	|■■■■■■■■■■
  0.001 [0]	|
  0.001 [0]	|
  0.001 [0]	|
  0.001 [1]	|■■■■■■■■■■


Latency distribution:
  10% in 0.0010 secs
  25% in 0.0010 secs
  50% in 0.0011 secs
  75% in 0.0012 secs
  90% in 0.0014 secs
  0% in 0.0000 secs
  0% in 0.0000 secs

Details (average, fastest, slowest):
  DNS+dialup:	0.0007 secs, 0.0007 secs, 0.0009 secs
  DNS-lookup:	0.0000 secs, 0.0000 secs, 0.0000 secs
  req write:	0.0001 secs, 0.0000 secs, 0.0003 secs
  resp wait:	0.0002 secs, 0.0001 secs, 0.0003 secs
  resp read:	0.0000 secs, 0.0000 secs, 0.0001 secs

Status code distribution:
  [200]	10 responses



--- PASS: TestBody (0.01s)
PASS


Process finished with the exit code 0

---

hey_test.go result:

=== RUN   TestParseValidHeaderFlag
--- PASS: TestParseValidHeaderFlag (0.00s)
=== RUN   TestParseInvalidHeaderFlag
--- PASS: TestParseInvalidHeaderFlag (0.00s)
=== RUN   TestParseValidAuthFlag
--- PASS: TestParseValidAuthFlag (0.00s)
=== RUN   TestParseInvalidAuthFlag
--- PASS: TestParseInvalidAuthFlag (0.00s)
=== RUN   TestParseAuthMetaCharacters
--- PASS: TestParseAuthMetaCharacters (0.00s)
PASS


Process finished with the exit code 0