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https://issues.apache.org/jira/browse/TS-4903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529960#comment-15529960
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James Peach commented on TS-4903:
---------------------------------
Here's what happens:
{noformat}
[pid 12346] sendmsg(57, {msg_name(16)={sa_family=AF_INET, sin_port=htons(80),
sin_addr=inet_addr("x.x.x.x")}, msg_iov(1)=[{"GET /encr64kb.test
HTTP/1.1\r\nCac"..., 433}], msg_controllen=0, msg_flags=0}, MSG_FASTOPEN) = -1
EINPROGRESS (Operation now in progress)
[pid 12346] sendmsg(57, {msg_name(16)={sa_family=AF_INET, sin_port=htons(80),
sin_addr=inet_addr("x.x.x.x")}, msg_iov(1)=[{"GET /encr64kb.test
HTTP/1.1\r\nCac"..., 433}], msg_controllen=0, msg_flags=0}, MSG_FASTOPEN) = 433
[pid 12346] sendmsg(57, {msg_name(16)={sa_family=AF_INET, sin_port=htons(80),
sin_addr=inet_addr("x.x.x.x")}, msg_iov(1)=[{"GET /encr64kb.test
HTTP/1.1\r\nCac"..., 433}], msg_controllen=0, msg_flags=0}, MSG_FASTOPEN) = -1
EISCONN (Transport endpoint is already connected)
{noformat}
Note that we are calling sendmsg(2) again, even though the previous call wrote
the data.
> EISCONN errors when using TCP Fast Open.
> ----------------------------------------
>
> Key: TS-4903
> URL: https://issues.apache.org/jira/browse/TS-4903
> Project: Traffic Server
> Issue Type: Bug
> Reporter: James Peach
> Assignee: James Peach
>
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