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<!-- Describe the issue -->

Summary

Sending ~200KB to bitcoind via RPC causes ECONNABORT for its connection.
Such operation cannot be possible via bitcoin-cli due to Linux's limitation, so it has to be done via HTTP libraries.
Confirmed on sendrawtransaction.

<!--- What behavior did you expect? -->

Expected

If you did sendrawtransaction <A Transaction that is very close to the weight limit>, it should return transaction hash.
Any other calls like getwalletinfo should work too.

<!--- What was the actual behavior (provide screenshots if the issue is GUI-related)? -->

Actual

ECONNABORT occured for sendrawtransaction <A Transaction that is very close to the weight limit>.
Any other calls like getwalletinfo worked normally.

<!--- How reliably can you reproduce the issue, what are the steps to do so? -->

Steps to reproduce

• Enable RPC
• Try example at Expected field.
  • To make such transaction, you may use 1 input and set 2910 outputs.
• ECONNABORT occured.

<!-- What version of Bitcoin Core are you using, where did you get it (website, self-compiled, etc)? -->

Bitcoin Core version

0.17.0.1, with binaries at website.

<!-- What type of machine are you observing the error on (OS/CPU and disk type)? -->

Computer information

$ uname -a
Linux *** [#42](/bitcoin-bitcoin/42/)-Ubuntu SMP Tue Oct 23 15:48:01 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

<!-- Any extra information that might be useful in the debugging process. -->

<!--- This is normally the contents of a `debug.log` or `config.log` file. Raw text or a link to a pastebin type site are preferred. -->

Doesn't sound like an issue with Bitcoin Core

Corresponding error in python is OSError: [Errno 7] Argument list too long fyi

For Google reference, try something like this:

cat transaction.txt | bitcoin-cli -stdin sendrawtransaction