multiple PDF set header
I have this in a loop but I have multiple files that I'd like to generate. I'm receiving Cannot set headers after they are sent to the client.
If I have one key, then it's fine. If I have more than one, it generates the second one, doesn't generate the first one and gives this error.
_.forEach(keys, async function(key)
try
const pdf = await myPDFd(key);
res.setHeader('Content-disposition', 'attachment; filename=' + key + '.pdf');
res.setHeader('content-type', 'application/pdf');
res.send(pdf);
res.end();
catch (error)
);
javascript node.js
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
add a comment |
I have this in a loop but I have multiple files that I'd like to generate. I'm receiving Cannot set headers after they are sent to the client.
If I have one key, then it's fine. If I have more than one, it generates the second one, doesn't generate the first one and gives this error.
_.forEach(keys, async function(key)
try
const pdf = await myPDFd(key);
res.setHeader('Content-disposition', 'attachment; filename=' + key + '.pdf');
res.setHeader('content-type', 'application/pdf');
res.send(pdf);
res.end();
catch (error)
);
javascript node.js
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
2
The problem is that you can't send two responses to one request (res.sendis sending the response on every loop step). Maybe you could compress the files and then send the response.
– Ariel Alvarado
Nov 15 '18 at 15:02
@ArielAlvarado is there a way to stop the response after one pdf is send? I thoughtres.endwould do so and create a new one on the next one?
– jaimers
Nov 15 '18 at 15:32
1
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36
add a comment |
I have this in a loop but I have multiple files that I'd like to generate. I'm receiving Cannot set headers after they are sent to the client.
If I have one key, then it's fine. If I have more than one, it generates the second one, doesn't generate the first one and gives this error.
_.forEach(keys, async function(key)
try
const pdf = await myPDFd(key);
res.setHeader('Content-disposition', 'attachment; filename=' + key + '.pdf');
res.setHeader('content-type', 'application/pdf');
res.send(pdf);
res.end();
catch (error)
);
javascript node.js
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
I have this in a loop but I have multiple files that I'd like to generate. I'm receiving Cannot set headers after they are sent to the client.
If I have one key, then it's fine. If I have more than one, it generates the second one, doesn't generate the first one and gives this error.
_.forEach(keys, async function(key)
try
const pdf = await myPDFd(key);
res.setHeader('Content-disposition', 'attachment; filename=' + key + '.pdf');
res.setHeader('content-type', 'application/pdf');
res.send(pdf);
res.end();
catch (error)
);
javascript node.js
javascript node.js
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
asked Nov 15 '18 at 15:00
jaimersjaimers
6091130
6091130
2
The problem is that you can't send two responses to one request (res.sendis sending the response on every loop step). Maybe you could compress the files and then send the response.
– Ariel Alvarado
Nov 15 '18 at 15:02
@ArielAlvarado is there a way to stop the response after one pdf is send? I thoughtres.endwould do so and create a new one on the next one?
– jaimers
Nov 15 '18 at 15:32
1
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36
add a comment |
2
The problem is that you can't send two responses to one request (res.sendis sending the response on every loop step). Maybe you could compress the files and then send the response.
– Ariel Alvarado
Nov 15 '18 at 15:02
@ArielAlvarado is there a way to stop the response after one pdf is send? I thoughtres.endwould do so and create a new one on the next one?
– jaimers
Nov 15 '18 at 15:32
1
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36
2
2
The problem is that you can't send two responses to one request (
res.send is sending the response on every loop step). Maybe you could compress the files and then send the response.– Ariel Alvarado
Nov 15 '18 at 15:02
The problem is that you can't send two responses to one request (
res.send is sending the response on every loop step). Maybe you could compress the files and then send the response.– Ariel Alvarado
Nov 15 '18 at 15:02
@ArielAlvarado is there a way to stop the response after one pdf is send? I thought
res.end would do so and create a new one on the next one?– jaimers
Nov 15 '18 at 15:32
@ArielAlvarado is there a way to stop the response after one pdf is send? I thought
res.end would do so and create a new one on the next one?– jaimers
Nov 15 '18 at 15:32
1
1
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36
add a comment |
1 Answer
1
active
oldest
votes
Your way is not possible.
Each HTTP request responses exactly 1 type of data (one PDF file in your case). Not possible to send 2 files via 1 HTTP request.
You have to create some logic on client (two download links, for example). Client (user or app) must perform two separate actions (run two separate HTTP requests) for 2 files downloading.
Alternatively you can compress this two files to ZIP (or another package type) and send this one ZIP file to user. But in this case user (or app) will have to uncompress it as additional step. You can use node-zip library.
answered Nov 15 '18 at 15:33
MartinMartin
18923
Thanks. I'll do the zip but just curious, I thoughtres.end()would end the request in the loop and restart on the next?
– jaimers
Nov 15 '18 at 15:36
res.end()will completely close the connection. No additional data can be send after callres.end()and there is no possibility to reopen closed connection byres.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.
– Martin
Nov 15 '18 at 15:39
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your way is not possible.
Each HTTP request responses exactly 1 type of data (one PDF file in your case). Not possible to send 2 files via 1 HTTP request.
You have to create some logic on client (two download links, for example). Client (user or app) must perform two separate actions (run two separate HTTP requests) for 2 files downloading.
Alternatively you can compress this two files to ZIP (or another package type) and send this one ZIP file to user. But in this case user (or app) will have to uncompress it as additional step. You can use node-zip library.
answered Nov 15 '18 at 15:33
MartinMartin
18923
Thanks. I'll do the zip but just curious, I thoughtres.end()would end the request in the loop and restart on the next?
– jaimers
Nov 15 '18 at 15:36
res.end()will completely close the connection. No additional data can be send after callres.end()and there is no possibility to reopen closed connection byres.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.
– Martin
Nov 15 '18 at 15:39
add a comment |
Your way is not possible.
Each HTTP request responses exactly 1 type of data (one PDF file in your case). Not possible to send 2 files via 1 HTTP request.
You have to create some logic on client (two download links, for example). Client (user or app) must perform two separate actions (run two separate HTTP requests) for 2 files downloading.
Alternatively you can compress this two files to ZIP (or another package type) and send this one ZIP file to user. But in this case user (or app) will have to uncompress it as additional step. You can use node-zip library.
answered Nov 15 '18 at 15:33
MartinMartin
18923
Thanks. I'll do the zip but just curious, I thoughtres.end()would end the request in the loop and restart on the next?
– jaimers
Nov 15 '18 at 15:36
res.end()will completely close the connection. No additional data can be send after callres.end()and there is no possibility to reopen closed connection byres.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.
– Martin
Nov 15 '18 at 15:39
add a comment |
Your way is not possible.
Each HTTP request responses exactly 1 type of data (one PDF file in your case). Not possible to send 2 files via 1 HTTP request.
You have to create some logic on client (two download links, for example). Client (user or app) must perform two separate actions (run two separate HTTP requests) for 2 files downloading.
Alternatively you can compress this two files to ZIP (or another package type) and send this one ZIP file to user. But in this case user (or app) will have to uncompress it as additional step. You can use node-zip library.
answered Nov 15 '18 at 15:33
MartinMartin
18923
Your way is not possible.
Each HTTP request responses exactly 1 type of data (one PDF file in your case). Not possible to send 2 files via 1 HTTP request.
You have to create some logic on client (two download links, for example). Client (user or app) must perform two separate actions (run two separate HTTP requests) for 2 files downloading.
Alternatively you can compress this two files to ZIP (or another package type) and send this one ZIP file to user. But in this case user (or app) will have to uncompress it as additional step. You can use node-zip library.
answered Nov 15 '18 at 15:33
MartinMartin
18923
edited Nov 15 '18 at 15:41
answered Nov 15 '18 at 15:33
MartinMartin
18923
answered Nov 15 '18 at 15:33
MartinMartin
18923
answered Nov 15 '18 at 15:33
MartinMartin
18923
18923
Thanks. I'll do the zip but just curious, I thoughtres.end()would end the request in the loop and restart on the next?
– jaimers
Nov 15 '18 at 15:36
res.end()will completely close the connection. No additional data can be send after callres.end()and there is no possibility to reopen closed connection byres.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.
– Martin
Nov 15 '18 at 15:39
add a comment |
Thanks. I'll do the zip but just curious, I thoughtres.end()would end the request in the loop and restart on the next?
– jaimers
Nov 15 '18 at 15:36
res.end()will completely close the connection. No additional data can be send after callres.end()and there is no possibility to reopen closed connection byres.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.
– Martin
Nov 15 '18 at 15:39
Thanks. I'll do the zip but just curious, I thought
res.end() would end the request in the loop and restart on the next?– jaimers
Nov 15 '18 at 15:36
Thanks. I'll do the zip but just curious, I thought
res.end() would end the request in the loop and restart on the next?– jaimers
Nov 15 '18 at 15:36
res.end() will completely close the connection. No additional data can be send after call res.end() and there is no possibility to reopen closed connection by res.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.– Martin
Nov 15 '18 at 15:39
res.end() will completely close the connection. No additional data can be send after call res.end() and there is no possibility to reopen closed connection by res.end(). When you close the connection, the TCP HTTP connection is finished and since this time the client does not know, that you are doing any additional commands on the server.– Martin
Nov 15 '18 at 15:39
add a comment |
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2
The problem is that you can't send two responses to one request (
res.sendis sending the response on every loop step). Maybe you could compress the files and then send the response.– Ariel Alvarado
Nov 15 '18 at 15:02
@ArielAlvarado is there a way to stop the response after one pdf is send? I thought
res.endwould do so and create a new one on the next one?– jaimers
Nov 15 '18 at 15:32
1
You cannot initiate the second connection. Server cannot initiate connection to client (not by HTTP). Second connection initialization must comes from client to server (same way as a first connection).
– Martin
Nov 15 '18 at 15:36