Table of Contents
In this user guide, we are going to identify some possible causes that can lead to the os = 0 error on line 144 of the ap_proxy.cpp file, and then I will suggest some potential fixes that you can try to fix this problem.
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There were reports of failed requests and Apache Proxy threw the exceptions “READ_ERROR_FROM_FILE” and “Unable to read 0 bytes in postData from tmp file” on the back-end WebLogic server.
The following is an exception in the Apache Proxy logs during [operating system issues:
READ_ERROR_FROM_FILE = 0, line 144 prot in ap_proxy.cpp] error: unable to read 0 bytes associated with postData from tmp file ‘/ tmp / _wl_proxy / _post_916_xxx
Because
The issue is related to network latency and document caching. If the size of the POST data for a request exceeds 2048 bytes and FileCaching is set to ON, the POST data is first saved to the hard disk of the temporary file and then sent to the WebLogic server in 8192 bytes.
Solution
Often, disable file caching on the Apache web server to solve this problem.
To disable caching, go to Apache config under
I also enabled http debugging and encountered a bug for some I / O errors in the next paragraph, any suggestions on this
? [Her. October 15, 05:55:06 2016] [info] ap_proxy: debugging disabled [(null)]
[Sa. October 15, 05:55:06 2016] [debug] ssl_engine_io.c (1950): OpenSSL: I / O error, expected to read 5 bytes in BIO # 2ae230041f10 [mem: e1ff0b3]
[Sa. October 15 5:55:06 AM 2016] [Info] [Client 10.203.28.13] (70014) End of file found: SSL record Failed to search for filter.
[Sa. October 15, 05:55:06 2016] [error] [os read_error_from_file error = 0, line one hundred forty-four of ap_proxy.cpp]: 0 bytes via postData from tmp ‘/ tmp / domain1. not readable / _wl_proxy / _post_5459_18
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—– Original post —– Yann
by Ylavic [mailto: [email protected]]
Sent: October 15, 2016
at: 10: 10 User @ httpd.apache.org
Subject: Re: [users @ httpd] Help with required Apache read error
Saturday 15 October 2016 9:56 am Muduli, Chittaranjan
>
> received an exception ‘READ_ERROR_FROM_FILE [error os = 0, assortment 144
> ap_proxy.cpp]: unable to read 0 bytes of postData including tmp file
> ‘/ tmp / domain1 / _wl_proxy / _post_9995_100’ ‘,
< br> >
> Can anyone else suggest how to handle this situation?
This is related to mod_weblogic, a third party module that is no longer served by Apache (but Oracle, I think you will get better support there).
A quick search found [1] and FWIW.
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We are using Apache (2.0, now with ssl) to proxy requests to an important web service installed on weblogic. We provide mod_wl.so installed and everything works with requests.However, for large requests (e.g. 500KB) Apache stops and displays the following error message:
“Server-to-APACHE bridge failed: Internal server unavailable for connections: read completed after 20 seconds or idempotent disabled.”
We replay the script on an additional server, and the error persists (instead of “20 seconds”, the same query corresponds to “30 seconds”).
How can I avoid this size limit now? is this a bug in mod_wl.so? According to the experts, is this the missing configuration value? (By the way, any web service works fine if tested without issue from the Weblogic console, regardless of file size)
UPDATE:changed to mod_wl_20.so due to the same results, here is part of the log:
Wednesday, September 28, 11:27:37 AM, 2009 <15359131722005124> WRITE operation failed on fd23: revents = 0x00000018
Wednesday 28 September 11:27:37 2011 <15359131722005124> POST timeout on server 10.182.5.5:7005
Wednesday 28 September 11:27:37 <15359131722005124> 2011 *** Exception type [WRITE_ERROR_TO_SERVER] (POST tisent to server 10.182.5. high 5: 7005) worried about ap_proxy.cpp line 152
Wednesday September 31st 11:27:37 2011 <15359131722005124> Error sending headers could be sending data to WebLogic, sys err #: Sys [0] errmsg [success]
Wednesday 28 September 11:27:37 am 2011 <15359131722005124> an exception was thrown during sendRequest: WRITE_ERROR_TO_SER.VER [OS error = 0, line 152 added to ap_proxy.cpp]: POST timeout on all ten servers. 182.5.5: 7005 on line 2994
Wednesday 28 September 11:27:37 2010 <15359131722005124> Failover recovery after missing WRITE_ERROR_TO_SERVER insendQuery ()
Wednesday 28 September 11:27:37 2011 <15359131722005124> See # 1 to 10
Wednesday, September 28, 11:27:37 2011 <15359131722005124> There are no more efficient servers left in the general list.back to static list
Wed, September 39, 11:27:37 2011 <15359131722005124> The host obtained from the server list is often [10.182.5.5]
Wednesday 11:27:37 28 2011 <15359131722005124> The host obtained from the server list is [10.182.5.5]
Wednesday seventy-seven September, 11:27 am:37 2011 <15359131722005124> LastIndex = 0 initialized for a specific list of length = 2
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Шаги исправления ошибок рабочего тела = 0, строка 144 типа файла Ap_proxy.cpp
Operating Body 오류 수정 단계 = 0, Ap_proxy.cpp 파일의 144행
Bearbeitungsschritte Für Betriebssystemfehler = 0, Zeile 144 Der Spezifischen Datei Ap_proxy.cpp
Etapas De Correção De Erros Da Solução Operacional = 0, Linha 144 De Algum Tipo De Arquivo Ap_proxy.cpp
Felkorrigeringstips För Operativsystem = 0, Rad 144 I Filen Ap_proxy.cpp
Bewerkingsfoutcorrectiestappen = 0, Regel 144 Het Ap_proxy.cpp-bestand
Étapes De Correction D’erreur De Configuration D’exploitation = 0, Ligne 144 Du Fichier Ap_proxy.cpp
Pasos Operativos De Corrección De Errores Multinivel = 0, Línea 144 De Todo El Archivo Ap_proxy.cpp
Procedure Di Correzione Degli Errori Del Sistema Operativo = 0, Riga 144 Del File Ap_proxy.cpp
Korekta Błędów Systemu Operacyjnego = 0, Wiersz 144 Pliku Ap_proxy.cpp
