javascript - Using Express' route paths to match `/` and `/index` -

-

i'm using express , want match / , /index same route. if write

app.route('/(index)?')

node throws error:

c:\myproject\node_modules\express\node_modules\path-to-regexp\index.js:69   return new regexp(path, flags);          ^ syntaxerror: invalid regular expression: /^\/(?(?:([^\/]+?)))?e\/?$/: invalid group     @ new regexp (native)     @ pathtoregexp (c:\myproject\node_modules\express\node_modules\path-to-regexp\index.js:69:10)     @ new layer (c:\myproject\node_modules\express\lib\router\layer.js:32:17)     @ function.proto.route (c:\myproject\node_modules\express\lib\router\index.js:482:15)     @ eventemitter.app.route (c:\myproject\node_modules\express\lib\application.js:252:23)     @ c:\myproject\server.js:28:19     @ array.foreach (native)     @ object.<anonymous> (c:\myproject\server.js:27:18)     @ module._compile (module.js:460:26)     @ object.module._extensions..js (module.js:478:10)

note if use

app.route('/foo(bar)?')

it works fine...

the question mark optional route parameters, not optional route segments. example:

app.route('/:myvar?');

with app.route('/(index)?'); matching routes literally "http://myapp.com/(index)".

you want regular expression route.

app.route(/^\/(index)?$/);

  • ^ - matches beginning of line, whole expression must match beginning.

  • \/ - escaped forward slash, express route handlers start with.

  • (index)? - works expect because it's regular expression. contents of parenthesis optional because of question mark.

  • $ - matches end of line, whole expression must match way end.

if omit ^ , $ regular expression engine try match expression against substrings of route bit more expensive checking if entire url string matches, , lead route matches didn't expect. @robertkelp suggestion.


Comments

Post a Comment

Popular posts from this blog

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops', ...
Read more

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null ...
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens ...
Read more