[Lazarus] [SPAM] - Re: THTTPApplication does not close the TCP Connection

[Michael Van Canneyt]

On Wed, 17 Jul 2013, Jansen, Dirk wrote:

>>> I tested a simple http application and found that the
> THTTPApplication
>>> does not close the connection.
>>>
>>> A normal web server always close the connection after sending the
> HTML
>> page but this webserver does not close the connection. As a result of
>> this every second request from a web browser (Firefox, IE) does not
>> work. The browser starts the request than it waits for a very long
> time.
>> If you interrupt the browser and start a new request you get an
> answer.
>
>> That is not correct.
>
>> In HTTP 1.1 The browser sends a HTTP header which determines if the
> connection should be closed or not.
>
>> Secondly, THTTPApplication is an apache module. There it is apache
> which determines what happens to the
>> connection, not the FPC code.
>
> The THTTPApplication is part of the standalone "HTTP server Application"
> (default project) of the weblazextra package. There is no apache server
> involved.
>
> There is no difference if I user http 1.0, http 1.1 or if I set
> "Connection: close".
>
> It is also impossible to send a second request over the open connection.

I have tested, and a strace shows that the connection is always closed:

accept(3, {sa_family=AF_INET, sin_port=htons(59845), sin_addr=inet_addr("127.0.0.1")}, [16]) = 4
mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc61cecb000
recvfrom(4, "GET /me.html HTTP/1.1\r\nHost: loc"..., 4096, 0, NULL, NULL) = 1801
mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc61cec3000
write(1, "Treating URI : /me.html\n", 24Treating URI : /me.html
) = 24
mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc61cebb000
access("/home/michael/FPC/trunk/packages/fcl-web/examples/httpserver/me.html", F_OK) = -1 ENOENT (No such file or directory)
sendto(4, "HTTP/1.1 404 Not Found\r\nStatus: "..., 67, 0, NULL, 0) = 67
munmap(0x7fc61cecb000, 32768)           = 0
close(4)                                = 0
accept(3, {sa_family=AF_INET, sin_port=htons(59846), sin_addr=inet_addr("127.0.0.1")}, [16]) = 4
recvfrom(4, "GET /favicon.ico HTTP/1.1\r\nHost:"..., 4096, 0, NULL, NULL) = 584
write(1, "Treating URI : /favicon.ico\n", 28Treating URI : /favicon.ico
) = 28
access("/home/michael/FPC/trunk/packages/fcl-web/examples/httpserver/favicon.ico", F_OK) = -1 ENOENT (No such file or directory)
sendto(4, "HTTP/1.1 404 Not Found\r\nStatus: "..., 67, 0, NULL, 0) = 67
close(4)                                = 0
accept(3, {sa_family=AF_INET, sin_port=htons(59847), sin_addr=inet_addr("127.0.0.1")}, [16]) = 4
recvfrom(4, "GET /favicon.ico HTTP/1.1\r\nHost:"..., 4096, 0, NULL, NULL) = 614
write(1, "Treating URI : /favicon.ico\n", 28Treating URI : /favicon.ico
) = 28
access("/home/michael/FPC/trunk/packages/fcl-web/examples/httpserver/favicon.ico", F_OK) = -1 ENOENT (No such file or directory)
sendto(4, "HTTP/1.1 404 Not Found\r\nStatus: "..., 67, 0, NULL, 0) = 67
close(4)                                = 0
accept(3,


Michael.