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Error: Can't set headers after they are sent to the client

...) { if (err) { res.send(err); } else { User.findOneAndUpdate({ _id: req.user._id }, { $push: { article: doc._id } }) .exec(function(err, doc2) { if (err) res.send(err); else res.json(doc2); // Will be called second. }) res.json(doc1); // Will be ...
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How to check what user php is running as?

... If available you can probe the current user account with posix_geteuid and then get the user name with posix_getpwuid. $username = posix_getpwuid(posix_geteuid())['name']; If you are running in safe mode however (which is often the case when exec is disabled), then it's unlikely tha...
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Mysql: Select rows from a table that are not in another

... all join conditions manually: SELECT a.* FROM tbl_1 a NATURAL LEFT JOIN tbl_2 b WHERE b.FirstName IS NULL share | improve this answer | ...
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SHA-1 fingerprint of keystore certificate

...-keypass android for Release mode: keytool -list -v -keystore {keystore_name} -alias {alias_name} example: keytool -list -v -keystore C:\Users\MG\Desktop\test.jks -alias test On windows, when keytool command is not found, Go to your installed JDK Directory e.g. <YourJDKPath>\Java\j...
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delete word after or around cursor in VIM

... what's the difference between dw and daw ? – AK_ Mar 13 '17 at 17:00 5 @AK_ Late response, ...
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How to tell if a browser is in “quirks” mode?

...eally true? What are all the possible values? – still_dreaming_1 Sep 16 '16 at 19:25 ...
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怎么往SetTimer的回调函数传递参数 - C/C++ - 清泛网 - 专注C/C++及内核技术

...立一个Win32工程,然后看自动生成的代码: int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { ... // 主消息循环: while (GetMessage(&msg...
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Is it possible to specify the schema when connecting to postgres with JDBC?

...also set the user's default schema to your desired schema: ALTER USER user_name SET search_path to 'schema' share | improve this answer | follow | ...
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How to build an APK file in Eclipse?

... The APK file is in the /workspace/PROJECT_FOLDER/bin directory. To install the APK file in a real device: Connect your real device with a PC/laptop. Go to sdk/tools/ using a terminal or command prompt. adb install <FILE PATH OF .APK FILE> That's it... ...
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Where do I find the current C or C++ standard documents?

...O/IEC 9899:2018: $185 from SAI Global / $116 from INCITS/ANSI / N2176 / c17_updated_proposed_fdis.pdf draft from November 2017 (Link broken, see Wayback Machine N2176) C11 – ISO/IEC 9899:2011: $30 $60 from ansi.org / WG14 draft version N1570 C99 – ISO 9899:1999: $30 $60 from ansi.org / WG14 draf...