HttpHeaders set vs. append in Angular
I have a caching interceptor that checks if the request has an x-refresh header present. If so, it ignores any cached request/response combo for this endpoint and goes to the server. However, when I use it in a service call, I have to use the append(...) method instead of the set(...) method on Angular's HttpHeaders class. I couldn't figure out from the documentation or online searches why that is. req.headers.get(x-refresh) returns what I would expect only if append('x-refresh', '') is used. req.headers.get('x-refresh') doesn't return anything if I use set('x-refresh', ''). Why is that? I looked at the source code for this and I don't see anything that would change this behavior, but I'm assuming it is something I overlooked.
What is the difference between set and append other than set will overwrite the header with that key if it already exists, otherwise set it, whereas append will append to that header if it is allowed to append to that header?
angular http-headers angular-httpclient
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
add a comment |
I have a caching interceptor that checks if the request has an x-refresh header present. If so, it ignores any cached request/response combo for this endpoint and goes to the server. However, when I use it in a service call, I have to use the append(...) method instead of the set(...) method on Angular's HttpHeaders class. I couldn't figure out from the documentation or online searches why that is. req.headers.get(x-refresh) returns what I would expect only if append('x-refresh', '') is used. req.headers.get('x-refresh') doesn't return anything if I use set('x-refresh', ''). Why is that? I looked at the source code for this and I don't see anything that would change this behavior, but I'm assuming it is something I overlooked.
What is the difference between set and append other than set will overwrite the header with that key if it already exists, otherwise set it, whereas append will append to that header if it is allowed to append to that header?
angular http-headers angular-httpclient
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28
add a comment |
I have a caching interceptor that checks if the request has an x-refresh header present. If so, it ignores any cached request/response combo for this endpoint and goes to the server. However, when I use it in a service call, I have to use the append(...) method instead of the set(...) method on Angular's HttpHeaders class. I couldn't figure out from the documentation or online searches why that is. req.headers.get(x-refresh) returns what I would expect only if append('x-refresh', '') is used. req.headers.get('x-refresh') doesn't return anything if I use set('x-refresh', ''). Why is that? I looked at the source code for this and I don't see anything that would change this behavior, but I'm assuming it is something I overlooked.
What is the difference between set and append other than set will overwrite the header with that key if it already exists, otherwise set it, whereas append will append to that header if it is allowed to append to that header?
angular http-headers angular-httpclient
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
I have a caching interceptor that checks if the request has an x-refresh header present. If so, it ignores any cached request/response combo for this endpoint and goes to the server. However, when I use it in a service call, I have to use the append(...) method instead of the set(...) method on Angular's HttpHeaders class. I couldn't figure out from the documentation or online searches why that is. req.headers.get(x-refresh) returns what I would expect only if append('x-refresh', '') is used. req.headers.get('x-refresh') doesn't return anything if I use set('x-refresh', ''). Why is that? I looked at the source code for this and I don't see anything that would change this behavior, but I'm assuming it is something I overlooked.
What is the difference between set and append other than set will overwrite the header with that key if it already exists, otherwise set it, whereas append will append to that header if it is allowed to append to that header?
angular http-headers angular-httpclient
angular http-headers angular-httpclient
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
asked Nov 26 '18 at 20:58
Jake SmithJake Smith
86711339
86711339
Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28
add a comment |
Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28
Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28
Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28
add a comment |
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Please, if you want me to close this question, tell me why. I'm not allowed to ask this question on Angular's GitHub page, and they ask me to come here to StackOverflow. If I'm doing something wrong, I'd be happy to fix the issue. I'm interested in getting help, not being annoying. Thanks.
– Jake Smith
Nov 26 '18 at 22:28